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My system, built about a year ago:

ASUS P5K-VM G33 Motherboard
Intel Core 2 Duo E6550 Conroe (2.33GHz) OC'd to 3.3 @ 1.35-.4v, idle 30C load 45C
EVGA 256-P2-N751-TR GeForce 8600 GT 256MB
OCZ StealthXStream 600W PSU
ZEROtherm BTF90 Silent UFO CPU Cooler
Crucial Ballistix 2 x 1GB DDR2 1066 (PC2 8500)

My PC's is generally on 24/7, I've done this for years on my other computers without a problem. Recently I started turning it off overnight to save on power costs. About the third day of starting it up in the morning, instead of doing its usual start of; spinning the fans, powering off, then starting up again successfully, it powers straight up but my monitor receives no input(blank screen/standby) and neither does my mouse.

I've reset the CMOS leaving the battery out and jumpers switched for an hour, no change. I've unplugged every peripheral but the video card/monitor, and ram but no change.

While I was running it (still not working) I noticed the cpu heatsink wasn't warm at all, while the Northbridge, ram, and video card and hard drives were.

I unplugged cpu fan and let it run, which I have read if the cpu is working it should shut down the system after about a min from overheating(confirm?), I let it go for about 20mins then stopped when I felt the bottom of the sink was just room temperature.

So I've pretty sure the cpu is dead which seems strange after only a year, this was my first attempt at OCing and I've read the higher voltage does decrease lifespan but it still seems odd. I'd like to know if there's a way I can check that the mobo's ok short of putting in a new cpu, or if there's some other things I could check on.

Any help is appreciated.
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