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Re: 8400 will not shut down properly
Evidently you have an operative system problem... if you cannot find the error by yourself, try reinstalling your os... if its too hard or you think the problem does not "deserve" that kind of sollution try deleting your account and making a new one if you use windows xp, this MIGHT help, but nothing better than reinstallation.
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There are 2 basic fans in Dell tower one for the power supply and the other for the Processor. If your computer is not booting then the Processor fan is most likely to be the culprit. What could be happening is that the Processor fan is no longer turning fast enough to cool the processor, so normal the processor when it over heats there is either protection to switch off the computer automatically or the computer won't boot. The best thing is to change the fan and make sure it is working properly but checking on the cables that they won't entangle on top of the fan to impede it's movement. You can easily damage your processor if the fan is not working properly.
Sounds like you CMOS battery is FLAT, please locate and replace, it is a 3.6V flat "Cell" This may just sort you out. Checksum error is because, something is different from the stored checksum it has in memory.
Do you have any USB devices connected to your computer. Disconnect your USB devices and restart your computer. Keep tapping the F1 key to go to the BIOS. Fress F5 and then F10 and wait till the computer boots to the desktop. And check if it would still shut down. If yes, then probably the issue is with the motherboard.