Okay, I found a solution, though this is absolutely bizarro. I had only one moving part left inside the case, and that was the PSU fan. I deconned that, and the whistling continued. I removed the sound card. I removed the RAM stick by stick. I disconnected the CD drive. Literally, there was nothing in the end except the motherboard, G400, PSU (without fan), one 256MB RAM stick, and the HDD. After examination there were no sound emitters on the motherboard. I was like "WTF???" I even ran an extension cord from the main breaker room in case it was wall power instability causing it.
After taking a freaking stethoscope (sp?) to the thing, I found the culprit: the HDD. The arm inside of it was grinding against one of the platters causing it to whistle.
What is amazing is that I was still getting data feed from that drive ... when I cracked the drive open, it looked like someone set some thermite off in there.
I popped in a new 80GB Maxtor 8MB 7200 and everything is running smooth and quiet now. I also replaced my poor, wrongly accused speaker to its rightful place of glory.
Thanks for all the ideas, though. This has been driving me nuts for the last week!
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#!/bin/sh {who;} {last;} {pause;} {grep;} {touch;} {unzip;} mount /dev/girl -t {wet;} {fsck;} {fsck;} {fsck;} {fsck;} echo yes yes yes {yes;} umount {/dev/girl;zip;} rm -rf {wet.spot;} {sleep;} finger: permission denied
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