Hello.  My computer is a Dell Dimension 8100, P4, 1.4Ghz, 384mb mem, 40Gb HD.  I have virtually let this computer run non-stop since 2001, rebooting only periodically as needed, without problem.  However, over the last few months I have started to shutdown each night because the computer is making a "fluttery, chirping" noise (best choice of words I can think of).  Drive Integrity tests results and lack of hard drive problems have lead me to discount this as the source of the noise.  I really think it is my power supply fan but that leads to my real question.  Is there a way to know or test if my power supply fan is going bad before it is too late?

Thanks for any information or insights anyone can provide.

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