Forgive me if this is somewhat of a sidestreet (thread hijack?).
Yesterday I sent a Sony VAIO Digital Studio system back to Sony for "repairs" after it started emitting a strange, moderately loud, high-pitched shrieking sound on 11/17/2002. Prior to this point the system had been remarkably quiet, especially considering how fast it was and how many fans were in the system. The sound was NOT coming from the case fan or CPU fan, AFAICT, because it didn't vary in pitch when the system was first started. Likewise, it wasn't from the HD. It appeared to be coming from the video subsystem, but the internal structure of the PC didn't lend itself to easy investigation. Besides, it's under warranty. This is a system I use for simple video editing, so the noise was a considerable distraction, and it caused both my wife and myself to have headaches! Into the shop it went.
Why am I telling you all of this crap? I keep records of what / when I install on my systems, and those records get backed up to CD every day. I just looked in the Windows XP update records for that Digital Studio system. I installed the 40.72 drivers from the MS Windows Update Site on 11/17/2002. Doh! I must not have noticed the noise immediately because the wife was watching TV. (System is kept in the living room.) But on the next boot after the update we both noticed the noise!
Could most certainly be a coincidence, but it has me wondering now... Performance after the update seemed to be just fine, the only obvious performance-related change after installation being stuttering of the silly Windows startup sound when the system was booted. Don't know if the drivers could cause the video card to emit this shrieking sound or not. And, oh yes, I did turn off the speakers during testing, so I know that it wasn't any kind of crosstalk or feedback issue with audio on the system.
- prosaic
edited for clarity