Ack!! If I have to replace the mainboard, it's P4 time.
Oh no... there go any new toys for awhile
Terry, what is your machine now? A P III CPU? P II?
If it's a fairly recent P III, why go to the added expense of a P IV? You're looking at all new RAM, the mainboard and the CPU.
If your mainboard is bad, it's not that difficult to replace it and use your current RAM and CPU. Takes about 3-4 hours, then you'll have to tweak your applications...maybe reload some. It's best to format your hard drive and start fresh, though...that's what I would do.
As I mentioned in an earlier posting, if the mainboard is kaput, you 'puter probably wouldn't boot at all.
Now, if you can plug your ribbon cable (from the CD-ROM drive) in another socket (if you have one open), and the drive still doesn't work, it is probably the drive itself. They aren't that expensive...32x to 40x should be quite adequate.