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I will try to be as explicit in details so you guys have as much to go on as possible.

The basic problem is this.

I built a pretty amazing machine six months ago (hardware is shown at the end of this post). It has been running pretty well. I have several fans installed to cool things down as well as heat pipes on the mobo, but I noticed through the summer that it seemed to get hot and occasionally shut down after running for several days (this would happen OCCASIONALLY - NOT CONSISTENTLY and after letting it cool off for a few minutes it would start up without issue).

The other night it shut off. Now when I start it up the following happens. Power supply turns on and seems to be supplying power to everything (all fans are working). I do not get a POST (I get no signal to the monitor at all) and I do not get any diagnostic beeps.

I have tried the following with no change in result:
I disconnected the hard drives.
I reset CMOS.
I have pulled the RAM and reseated.
I pulled the video card and reseated.

My guess is that something blew, due to heat buildup (strange thing is that I really don't think it was running that hot because the temperature has cooled off considerably), but without any diagnostics I don't really know where to start.

Any help would be much appreciated.

System Specs:
Gigabyte N680SLI-DQ6 Mobo
Intel Core 2 Duo 3MHz
EVGA e-GeForce 8800GTS
4x1GB Corsair Dominator
Coolmax CTG-1000 1000W Power Supply
5 Seagate SATA Harddrives

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Last Post by oOHaloOo
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I seem to be facing the same problem. Almost on similar grounds. Of course, I am not running a configuration as high as you are. I am on an Intel DG965RY mobo & am using a Chieftec 350W Power Supply.

Were you able to find a solution to your problem? If yes, what did you do?

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does your heatsink got enough thermal compound on it? it could be a overheating problem..i encountered the same problem my computer keeps on restarting only to find out that my processor was faulty..but you need to double check there are a lot of causes for such problem, i supposed your devices are still under warranty as you said you just bought it six months ago, take it back to the dealer and request to change the parts

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This combo is able to report CPU temperatures, I believe. have you looked into this so that cguan_77's theory can be checked out?

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Thanks for all the replies till now. You guys helped a lot! My problem was detected... This was a faulty motherboard!

Also, I learnt one more, which I was not aware of... If you have RAM's of different frequencies, your machine is bound to reboot and give you strange behaviour! I have witnessed this!!

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