Network Cable and Hub Troubleshooting.

Does the PC (Workstation) see any network resources, servers, other workstations? Note that some versions of networking software display "remembered" resources, even when the PC can't access them, so you'll need to actually click on a given resource to see if it's really available.
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CD-ROM and DVD Troubleshooting.

The most basic and potentially most disastrous problem that can occur with a CD or DVD drive is a stuck tray. Will the tray eject when you press the eject button? Press it once, like a doorbell, and then move your finger away, or you may be sending it repeated open and close commands. The drive won't pop right open if it is actively playing a disc, and the operating system may be able to override the stop and open command. If you're trying to eject a music CD using Media Player software (clicking on a software eject button on the screen) and it doesn't work, try the manual button on the drive. If this is a newly installed drive, make sure you used the short screws shipped with the drive and not longer screws which can jam the mechanism. If there's a disc in the drive that can no longer be read, make sure the power supply lead is still seated in the socket on the back of the drive.
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CPU, RAM and Motherboard Troubleshooting.

Do you get a live screen? A message saying "No Video Signal" or anything similar doesn't count as a live screen in this case. You need to get at least as far as a BIOS screen, either the system BIOS or an adapter BIOS loading.
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Hardware Troubleshooting Tips For Mac.

One of the Mac’s greatest strengths is its ease of use. A related, but not as widely touted benefit is that Macs are pretty easy to troubleshoot, especially when compared to Windows-based PCs.
First of all, because Apple designed most of the hardware that goes into Macs and Mac clones as part of an integrated system, Mac hardware problems are much less frequent than Windows PC-based problems. Second, Mac hardware problems are often less complicated—loyal Mac enthusiasts will never have to worry about confusing subjects such as IRQs and the like.
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Software Troubleshooting Tips For Mac

These days, many people try to claim that Windows 95, 98 and/or Windows ME are "just as easy" as the Mac, but as soon as you scratch below the surface of each operating system, you’ll quickly discover that the Mac OS is still the better designed choice.
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Computer Software Troubleshooting Tips

Most problems that occur with computers are the result of software-related issues: programs that lock up, printers that suddenly won’t print, operating systems that won’t boot and lots of other common quandaries are all somehow related to the operation of software on your PC. So, if these kinds of problems happen to you, take comfort in the fact that the good news (if you can call it that), is that you’re not alone.
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Computer Hardware Troubleshooting Tips

Though they tend to cause some of the nastiest symptoms—computers that won't boot, scary and/or confusing error messages, etc.—computer hardware problems are usually the easiest type of problems to solve. The trick, as with all troubleshooting ventures, is to figure out where to start and then focus your efforts.
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