To confirm, disconnect the hard drive and boot from a CD. Or remove and replace the hard drive. If this doesn't confirm the hard drive's going bad or got a bad bearing, then disconnect the optical drive.
If none of this eliminates the noise, then you've got a very rare squeal from an electrical or electronic component. This was common in the days of vacuum tubes, not so common today.
-- Jim
----- Original Message ----- From: "Debra Platt" <[EMAIL PROTECTED]>
To: "iMac List" <[email protected]>
Sent: Thursday, March 17, 2005 6:28 AM
Subject: High-pitched noise
Can anyone tell me what might be making a very high-pitch sound from my imac 400mhz? Could it be the hard drive or something worse?
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