回复：Here are a few clues.

来源: 于 2010-01-04 10:09:26 [旧帖] [给我悄悄话] 本文已被阅读：次

1. CPU fan, especially it is wrapped with dust.
2. Case fan.
3. Power supply fan
4. Video card fan if any.
5. Old or bad hard drive.

Make sure all those fans are clear off any wires and lines.