Bad CPU sensor?

[CoonDawg]

The crucial stuff:

Vista Ultimate
E6400 @ ~2.8 (I can't remember exactly)
2GB DDR26400 overclocked (again, I can't remember, its pretty high though)
7600GT
Seagate 320GB
ECS 650i SLI

Today my computer had been giving me an odd siren beep through my speakers on and off while watching some videos, but I thought it was just the video itself so I ignored it. Then, I went to play a game and about a minute into it it went non-stop like an emergency siren. Thinking it was something to do with my soundcard ( have alot of things plugged into it), I fiddled with some wires and I restarted my computer. It beeped a few times more. Went to the game, and it started non-stop again.

I checked Everest, and it says my core temps are around 40C, which is a little high but I just moved and my computer is now in a corner so it might just be normal. However, the "CPU" temp is now at 90C. I tried playing a game and it went to 95-100, and the siren started again.

I'm deducing that the siren is sounding because my CPU temp is showing around 100C, but I know this is false as the fan is on and my core temps are low.

As for what my internal speaker is doing, don't ask me: I never plugged it in. Since I bought my computer the speaker hasn't worked (I think the wires are split on it or something, I forget, the case is old), so I don't even know the sound my motherboard makes when it starts. For all I know, it could be blaring itself bloody murder right now and I wouldn't know.

I've received no shutdowns or lockups from this problem. A few weeks ago I had some trouble with waking it up (sometimes it would give me a BSOD a minute or two after logging in), but since I've reduced the memory clocks I've not had the problem again and have decided is completely unrelated to this problem.

Basically my main question (if a solution can't be found) is how to shut the siren up? It is almost non-stop, pausing for only moments once in awhile (low-spots in games, more or less). If there is a way to shut off that sensor I would be most happy.

EDIT: Odd. I took the heatsink off the CPU (All 4 pins were properly seated), as well as removing the CPU from the motherboard (I lose a few seconds off my life every time I attempt that), cleaned everything and stuck it back on and now my temps are fine. How is that possible? If it was actually overheating (like this would suggest), why weren't my core temps really high, too? And better yet, I checked in my BIOS and my temp warning sound (as well as auto reboot) were turned off, so where and why was I getting a siren?

I'm going to go play a game and see if this continues.

EDIT 2: Well, the issue is gone now, problem solved. Why its solved I have no idea, maybe it was a buildup of dust or something, because I'm certain the heatsink was seated properly.

[geddes-i]

weird, i am getting exactly the same problem lately. games freeze and everything even tho it dont seem that hot. I might remove cpu as you did and c if that helps