Grant found this interesting bit of info on Microsoft’s support site:
http://support.microsoft.com//default.aspx?scid=kb;en-us;261186
SUMMARY
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During normal operation or in Safe mode, your computer may play “Fur Elise” or “It’s a Small, Small World” seemingly at random. This is an indication sent to the PC speaker from the computer’s BIOS that the CPU fan is failing or has failed, or that the power supply voltages have drifted out of tolerance. This is a design feature of a detection circuit and system BIOSes developed by Award/Unicore from 1997 on.
MORE INFORMATION
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Although these symptoms may appear to be virus-like, they are the result of an electronic hardware monitoring component of the motherboard and BIOS. You may want to have your computer checked or serviced.
For aditional related information, please see the following DFI Technologies Web site:
http://www.dfiusa.com/support/tech-support.html (http://www.dfiusa.com/support/tech-support.html)
Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
