Could be:
- Bad sectors, etc... on hard drive - I'd re-Fdisk & format if you don't have needed data, or can back it up by loading hard drive on another PC. Maybe a low level format with HD utility from HD manufacturer.
- dirty/scratched CD(for the cd problem) - clean/polish
- dirty CD-Rom drive(for the cd problem) - clean/test in another PC/replace
- loose/bad IDE cables - sometimes they loosen at the connector
- dirty motherboard - dust could be shorting something out or insulating a component so it heats up & doesn't function properly.
- bad mobo...
- Power supply could be on it's way out - this can cause so many random problems (looks like you swapped this already though)
- Virus
Personally, I'd strip it all down, clean everything, then install bare minimum - CPU/heatsink, RAM, Vid card, hard drive and CD-Rom drive. Boot from Windows CD(bootable 98 is the easiest), Fdisk hard drive, and try reinstalling Win2k. (can you fdisk from W2k disc? I never tried) If you still have problems after this, I'd consider it a hardware problem.
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