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Thanks for the reply and the interesting url. The problem described is opposite from the one I'm having (I only hear the squeal when power is applied), but the suggested diagnosis matches my theory...

Updates:

(To JesseKnows: The squeal does not come from the display side, it's something around the Northbridge.)

I tried an automotive stethoscope. It's pretty hard to locate the sound with...

Yes, I've had it running with the case apart. I even ran it without the hard drive (it still brings up the power-on screen), and without the connection to the digitizer. It still squeals :(.

I...

Thanks for responding.

But, to quote Paul Simon "I'll repeat myself, at the risk of being crude..." I don't think it's the fan.

I can put my ear up to the fan (the fan housing is quite obvious,...

Yep, I'm unfortunately pretty sure it's not the fan (never say never, I always say :). I could get my ear right up to the CPU, and it's a very electronic noise (at least the frequencies that I can...

I've got a TC1100 with the 1.1GHz Pentium M. After a RAM and disk upgrade a year ago, it's been operating almost 24/7 as our home (Ubuntu) server. It's been quiet, reliable, and relatively...