I'm with ya, I have a fan or a drive going bad right now, trying to narrow it down so I can replace the part. So far, on this PC I assembled, I've replaced two fans, a CPU cooler, a graphics card, and now probably the hard drive.
On the plus side, I'm moving to a pair of RAID drives if this one goes bad. ..
Must be ready for Windows 7, vista is just ok.
I'm also trying to wittle together a PC just out of the junk parts I have lying around, incidently, I think I have a complete one, circa 2005, lol.