More problems with the home box

My home Linux box is acting decidedly weird. This time, when it froze up and wouldn’t reboot I opened the side to clean out some dust. I noticed two strange things:

  1. One of the case fans wouldn’t spin when I pushed it, like all the others
  2. Even after I removed that fan, when I booted the CPU fans would spin for a second or two and then stop.

I left it to cool for a few minutes, and now it’s booting. But that business about the fans spinning and then stopping is worrying me. Could it be overheating, or a sign that this motherboard is nearly dead? I was bzip2-ing a large file when it happened, and the hard drives were making ugly noises.