It is very important to check a used computer thoroughly before buying it as it may lead to problems in the future. A hard drive will not show any outward signs but may be deteriorating. The same way the needle can suddenly slip and can cause scratches on the disc ultimately leading to memory loss as "used computer" s can fail any time. If they are checked, the faults which may occur can be known. Let us first see the possible faults which may occur while purchasing a used computer.Hard disk failures can happen due to heavy wear and tear over a period of time. The read and write heads of a hard disk are used to retrieve or recode data stored on the hard disk with the help of a disk platter rotating at a high speed. Over a period of time the risk of failure or malfunction of disk increases. Faulty sectors of the hard disks can be found out only if a full surface scan is done on the used computer. The scanning time depends on the capacity and size of the hard disk of the used computer. Many skip this procedure due to the time consuming process of scanning the whole disk and end up purchasing a used computer with a faulty sector.Monitors need to be checked for any faults. The malfunctioning of a monitor is called a dry joint which results in the monitor not working after getting warmed. This can be checked only if the monitor is made to work for at least 20 to 30 minutes after switching on the computer.Next is to look for any possibilities of the central processing unit getting freezed. Normally all the central processing units have a fan and heat sink for keeping the unit cool. Over a period of time the fans may not work properly due to the accumulation of dust and dirt resulting in over heating of the central processing unit and even leading to stopping from functioning. While buying a used computer the fan needs to be checked and if any abnormal sound is heard, it is not good for purchase.The used computer may have a higher possibility of getting crashed and freezed due to the usage of the operating system for a good number of years. There may be a cache or RAM fault due to the over exposure leading to loss of data. To increase the performance of the computer and to avoid crashing, the operating system of the used computer can be reinstalled with a new operating system or a fresh one.While checking the used computerss for any faults, it is good to disconnect the network connection if any present before performing the tests. Also it is advisable to check the drives like the CD or DVD by opening and closing them and also playing something on the drives to see how they work. Monitors of the "used computers" s can be checked for the resolution and brightness by trying different options of color, settings and so on. To check the hard disk size the CMOS setup can be gone through and to verify the speed of the processor, cache and RAM the pause button is pressed when it appears on the screen during the booting process. To check the booting process, the computer can be turned on and off a few times and seen how it responds. Checking should be done to see if all the passwords are erased before purchasing a used computers.
The small piece of circuit board, which is usually located underneath the plastic shell of your laptops screen casing, is probably the cause of one of the most common problems related to screen failure and, more specifically, dimness, or darkness to the screen itself.The main purpose of the inverter is basically to give power to the backlight. The way it works is simple, it takes power from the laptop itself by a small inverter lead that runs from the motherboard of the laptop, sometimes it is a direct lead on its own, other times this lead can be connected into the inverter through the LCD cable (the lead that runs from the motherboard to the back of the screen itself), giving the screen its visual display.At one end of the inverter, usually the left end, the lead that gives it power is plugged into a small white socket and from the other end, usually the right side, the backlight lead from the screen is plugged into another white socket. The backlight is a very small, thin, long, very delicate light bulb that runs along the very bottom or sometimes the side of the screen.The problems related to the inverter is dimness or darkness to the screen in most cases or flickering of the backlight. Sometimes it can stop the screen form working at all but not usually. A common fault with laptop screens is a dark or dim screen, generally it is assumed that it is the backlight that is at fault, sometimes this may be correct, however more often or not it is simply the inverter not working, or not giving the backlight the power it needs. The inverter is usually cheaper to replace than the backlight, as the backlight is very fragile and can be easily broken. On some occasions a repair of the inverter is possible, although usually labour charges on fixing the inverter can sometimes lead up to being more expensive than simply replacing it.When it comes to purchasing an inverter most companies will require the part number which is usually printed on a bar code on the outside of the inverter but sometimes you may need to look carefully to find it. If your lucky then you may get away with just stating what your laptop make and model is, for example I have an IBM Thinkpad T22 and I need an inverter, we try our hardest to locate the inverter with just these details, however sometimes you will need to provide the part number; here is an example of a part number from the inverter for an IBM Thinkpad T22, (10L1402). This inverter is also compatible with the IBM T21, and T20 all three laptops as a whole are basically the same apart from the processor.
So you might have already heard about the new Canon Pixma iP4200 thats doing the rounds in the computer hardware industry nowadays. Everybody is reviewing it, including us. Canon has been keeping mum over the longest-lasting-photo-prints debate for sometime now. Possible explanations include the newly released Pixma iP4200, with built-in duplex printing; individual cartridges; two paper-input trays; easy operation; inexpensive; great-looking photos; and 100-year print life. Epson, the leading contender for lasting prints, now has competition. The key ingredient to long-lasting prints is Canons ChromaLife 100 ink set, included in the Pixma iP4200. The company claims that when used with their branded photo papers, photos printed using ChromaLife 100 inks will last up to 100 years when stored properly.Compared with the iP4000, the iP4200 is less expensive, faster for business applications, and offers more longevity for photos. However, photos take a little longer to print and earn a lower quality rating than the iP4000, but the overall balance of features makes for an impressive package.The Pixma iP4200 uses Canon's Full-Photolithography Inkjet Nozzle Engineering (FINE) print head, which releases droplets as small as 1pl for each of the 1,536-nozzle cyan, magenta, yellow, and black print heads (plus 320 nozzles for pigment-ink black text), providing an effective color resolution of 9,600x2,400dpi. Two separate black ink cartridges for both a pigment-based black and a dye-based black, significantly improve photo output. Apart from five inks, the photo printer offers the advantage of two paper inputs: a standard paper feed tray in the rear and a second paper tray that slides into the front bottom. You could now easily load standard paper in one tray and photo paper in the other, and switch back and forth between standard printing and photos without having to swap out paper every time. One eco-friendly feature of this printer includes the ability to automatically print on both sides of a sheet of paper. However, it might take you three times as long to print a 10-page Microsoft Word document in this mode compared with printing one-sided sheets.The iP4200's driver can automatically adjust colour balance, you can access sliders that modify the intensity of the individual inks; you can also switch from sRGB to Windows Image Color Management (ICM). Grayscale printing simply requires the tick of a check box, and a simplistic Print Advisor wizard can quiz you on the type of document you're printing and recommend an appropriate paper.Other than duplexing, the Page Setup options include size and orientation, number of copies, border/borderless printing, and addition of a background image or a watermark. An Effects tab provides settings for optimizing the image; reducing noise; boosting contrast; or adding effects such as sepia, pink, and other colours. You can save your settings as a profile for reuse in another printing session. The Maintenance tab offers functions such as nozzle checks and cleaning, printhead alignment, and other tasks, including a bottom-plate-cleaning function that uses a folded letter-size sheet to tidy up before duplex printing.Graphics quality, rated at the high end of good, is suitable for schoolwork or internal business use, and is marginally good enough for an important client or customer you might want to impress. However, some visible problems with photos include a slight pink tint in monochrome photos and a tendency for some colours to be overly punchy. It was also a little troublesome to get a neutral gray out of the printer as prints tended toward either green or blue depending on the driver settings used.Refilling the Pixma iP4200 CartridgesThe new Canon PGI-5 and CLI-8 cartridges have an onboard chip to measure the ink level of each individual cartridge. The five individual ink cartridges in the Pixma iP4200 feature bright red LEDs that light up when properly installed. The cartridge lights also start blinking when ink is running low, and the blinking gets faster as the tanks get emptier. The numbers of the Pixma iP4200 cartridges are:PGI-5BK - Black pigment inkCLI-8BK - Black dye based inkCLI-8C - Cyan dye based inkCLI-8M - Magenta dye based inkCLI-8Y - Yellow dye based inkThese cartridges are also suitable for Pixma iP5200, iP5200r printers, MP500, MP800 and MP950 MFPs. Needless to say, many people would like to know if these cartridges can be refilled, or if compatible cartridges are available. As of now (February 2006), compatibles are not available for the PGI5 or CLI8 inks, probably for 2 reasons:The ink formulations are quite complex, and refill ink manufacturers need to ensure their inks will perform equivalent to the original Canon inks.Canon has patented the on-board chip; consequently, compatible manufacturers have to be very careful not to infringe that patent, which could leave them open to litigation. Canon recently won a lawsuit against a company in Japan, which was involved in the business of refilling and resale of Canon cartridges. Naturally, this will set back any plans for compatible cartridges.However, there are "refill ink" s available on the market and refilling instructions are available from ink vendors. Canon has very cleverly adapted their printers; if you refill the cartridges and re-insert them into the machine, a warning message will appear on your computer along the lines of:You are using refill ink in your cartridges. If you continue, your printer warranty will be void. You are prompted to press OK, and after doing so, the low ink warning facility on the printer no longer works. If this is the case, you must be very careful never to let the inks run dry, as this will burn your print head.
1. ObservationsYou hear clicking sounds emitting from your hard disk drive, either in a form of clicking or grinding sounds. This can happen when you power up your computer from start or halfway while working on your projects. 2. Possible Causes The irregular clicking or chunking sound usually indicates that your hard drive is suffering from physical damage. If you use a S.M.A.R.T enabled disk, you may see a warning of a imminent disk failure when you power up your computer. This problem can be caused by the following:- Head Crash- Bad Sectors - Mechanical Faults - Virtual Memory Paging 3. Resolution a. Head CrashThis is a physical damage of the disk platter when the head of a hard disk scratches the surface of the disk. The grinding sound is therefore observed when this occurs. Firstly, turn off your computer and do not attempt to power it up. Consult a data recovery firm immediately and avoid dismantling the disk to repair the problem yourself. Operating without the correct tools and a clean environment can result in further extensive damage which complicates the recovery process.b. Bad Sectors Typically bad sectors are physical damage of a span of disk area. The clicking sound happens when the head attempts to read from the same area of disk multiple times due to failed attempts. This can also occur when the head is unable to calibrate with the media servo tracks due to the gradual weakening of the magnetic domains on the platter that causes the drive to reset continuously. If the conditions of the disk is not too bad, a standard process is to perform a disk surface scan. This helps to mark all bad sectors and prevent your system from writing new data on the damaged areas of the disk.c. Mechanical FaultsSometimes these sounds can be a result of a defective spindle, Read Write head or loose components. If you are still able to access data on the disk, you are strongly advised to backup all your data immediately. Your disk is close to demise. If your disk stops spinning after a period of clicking sound, you may wish to send your disk to a reputable data recovery firm to recover your data.d. Virtual Memory PagingWhen your physical memory is full, the drive may perform numerous virtual memory paging at the same time maintaining the system's operation. This will result in excessive disk activity. To deal with this problem you can increase the physical memory by adding more RAM into your computer or use a secondary hard disk to contain the swap files. Further Notes Hard disk drive occasionally produces a whirring sound when it searches for a file which is heavily fragmented. This is caused by the spinning platters as the read-write heads zoom back and forth to access the sectors where the data is stored. It is important to distinguish the whirling sound from the clicking sound. This whirring sound can be reduced by periodically defragmenting your hard drive. Defragmenting reorganizes the scattered data on the hard drive to make files and programs run faster. It relocates the commonly accessed files to the beginning of the hard disk where data can load at a faster rate.For more information on Data Recovery Service, please visit our website at http://www.adrc.net/services/data-recovery/intro.htm
When you think trash, you surely dont think about your old, trusty personal computer. But thats exactly what will become of it when you make the inevitable move toward your next laptop or desktop. And, yes, buying a new computer is inevitable, considering the pace at which computer technology zips along. Just thinkabout a handful of years ago, a fast microprocessor for a laptop was at 233 MHz. Now youre looking at about at least 2 GHz! Thats Giga, with a G.So eventually, you will want a computer that can handle the latest software, the latest games, and the latest interactive Web sites, and then youll have to throw away your old computer, right? Wrong. Try selling your used computer instead. Throwing out your computer is one of the worst things you can do. For one, your computer may be useful for someone out there, even if just for scraps.Trashed computers and other digital equipment also make up one of the fastest growing, and most dangerous, new trash categories out there in your neighborhood landfall. On one hand, computers are generally bulky and made of plastic and other materials that wont be breaking down in a landfill for the next few million years. Whats more, other materials in your old computer are highly toxic to the environment, like mercury, lead and cadmium. Theyre so toxic that their actually name in the waste-management field is toxics.You dont have to be a techie or a scientist to understand the danger in thatnor the benefits of selling your computer. On the Internet, there are a vast number of auction and classifieds sites, some better than others, where you can download you computer to a worthy buyer.Before you boot up your replacement laptop or high-performance PC, however, be sure you read and compute the following tips. These tips will help you avoid the crashes and shutdowns that befall the computer seller who doesnt do his homework first.Hold onto all of the operating system and software manuals that came with your old computer. This will add value to your sale, not to mention it will make you a trusted seller for offering up these helpful books to the buyer. Erase all personal information from the hard drive. And were not just talking about simply putting stuff in the trash bin. Its extremely important to purge all data from your computers memory repository, even from invisible backup files on the hard drive. If youre not sure how to do this, ask your IT expert at work or a techie friend for advice. You dont want the next user to have access to your bank accounts, old e-mails, and other private info, do you?Uninstall any application from the hard drive that youd like to use on your next computer, keeping the installation disk and the software serial number for yourself. When it comes to software, the manufacturers made sure that you never really own software, you license it. So you dont get free reign to keep software on multiple computers. You only get one license, so you need to bring your licensed version with you to your new computer.Do your homework on your computers worth. Just like you would for a car, check around at other classifieds and auction sites to see what other people are selling your make and model for.Be sure you want to truly get rid of old faithful. You may be able to repair your old laptop rather than buy a new $2,000 Centrino model. Or you may be able to add RAM memory and a new hard drive to your four-year-old desktop rather than invest in a new $3,000 multimedia masterpiece. In other words, do a thorough cost-analysis of what it would take to rebuild your old computer, versus what it would cost to sell it and buy a new one. And check your heart too. You might be surprised just how attached you are to your old faithful.Once you go through these steps, you are prepared to make your move and sell, sell, sell. And then, of course, youll be ready to start on a whole new list of stepsfor buying a new computer. But thats a topic for another article!