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Used Computer Purchasing Guide
Purchasing a used personal computer can save you a lot of money but you have to be sure to check the computer rigorously before buying. There is nothing worse than spending a bunch of time getting a new computer all set up, customizing it to your liking, loading all your software on it and transferring all your files to it and having it fail soon after. Below are few of the primary items to check before buying a used computer. Buying a used computer is also a perfect way to get a unit complete with upgrades such as a USB TV tuner for very little or for free.
The hard drive is very important and probably the last component of a computer that you would want to fail. The mechanical components of a hard drive are virtually impossible to inspect before you a buy a computer. Because of this it can be pretty hard to predict if hard drive in a computer is on the verge of failure. Hard drive failures can be caused by internal issues such as the needle slipping and scratching the disc which will lead to failure. Hard drive failures can also be caused by heavy wear and tear. The read and write heads of a hard disk are used to retrieve and write data to a hard disk that is rotating at a high speed. Over a time the risk of failure or malfunction of a hard disk increases.
Hard drive failures from certain data related issued can be detected and prevented by a full system scan. The scan can detect faulty sectors of the hard disks. The size of hard drive and amount of data on it affect the time it takes to perform a system scan. Performing a disc scan is not difficult but many skip it because it can take a few hours to do a full scan. It is highly recommended that a full system scan be performed before buying a used computer.
Inspecting the CPU is also very important before buying a used computer. It is possible for the CPU to freeze. Freezing can occur due to overheating. CPUs have a fan and heat sink to keep the unit cool but the fan can wear out or not function properly due to the accumulation of dust and dirt which can result in the CPU overheating. It is fairly easy to check if the fan is functioning properly by listening to it and looking for excessive dust. An even, low pitched hum is the sound of a fan operating properly. Squeaks or variations in the sound or speed of the fan can indicate problems.
If the computer includes a monitor is should be inspected too. Dull or muted colors are signs that a monitor is near the end of its life. A fluttering picture and any easily discernible noise are worthy of concern as well. The condition of a monitor is even more important if the computer has a USB digital TV tuner.
The operating system should also be checked. Over time operating systems can slow down due to programs being added and deleted from the system. The registry can also become cluttered with deleted programs. Unfortunately, inspecting a computers operating system is something that only expert computer users can do effectively. It should not take and excessive amount of time to boot up. Ideally, after you purchase a used computer the hard drive will be re-formatted and the operating system and software reloaded.
All other hardware should also be checked. For instance, CD and DVD drives should open and shut easily and your should be able to read and write data to a disk. Other items that should be inspected are the USB TV tuner card, mouse and keyboard.
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