What's causing my system to crash and reboot

March 20, 2011 at 15:39:52
Specs: Windows 7, i5 w 4 - 2G strips
I have a Win7 system I constructed from parts last year. When first put together I had an occasional problem turning it on. Wouldn't come up until I switched off power then back on. Finally traced it when it was on a bench and I ran shutdown (supposedly successfully) but the fans kept running. Power supply was still on but CPU was off. Had to hold down the power button for a forced off when this happened. Later that problem disappeared spontaneously.

About six months later, a different problem started when the system would shut itself off without warning, then spontaneously restart. Fried my clams because the first time I lost 2 hours work. Then it would shut down occasionally (sudden blank screen followed by a restart). I learned to save my work occasionally in antitipation of the crash. At the recommendation of a repair place I replaced the power supply. During that operation I think I unseated the memory chips (don't know how) because it wouldn't come back up until I removed one of the chips and had the other in the second slot. After that, no more crashes but only running on 2Gig.

I took it into a computer repair place 180 miles away last Thursday for a checkup. They replaced the mother board, checked both my chips and said both were fine. At my request, they populated memory to the max (8 Gig) which included the memory chip I had pulled. Since then, the system has crashed 4 times with the same symptoms (comes back up immediately).

Does anyone know of anything about a marginal memory strip that would cause the above behavior because this has only occurred when both my original chips were in the system and not when the one was out? Or is there any other cause I'm not seeing.

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March 20, 2011 at 15:47:09
This problem has occurred with two different power supplies (both identical Cooler Master 550W supplies). I generally don't play games other than Win7 provided stuff. The only card on the board is a Wi-fi, all other functions come off the motherboard. If this problem did not occur for 2 months while I had the one chip out how could disk format affect it?

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March 20, 2011 at 15:56:10
Sorry for the delay, my system just crashed again.
There have been two different identical power supplies from Cooler Master 550W when this problem has occurred.
I do not play games except Win 7 stuff.
Only one card, Wi.Fi. Everything else runs from the mother board.
This problem did not occur when the one chip was out of the system for two months. How does disk format affect that?

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March 20, 2011 at 16:13:16
My system is an Intel DQ57TH motherboard with 4 - 2Gig DDR3 memory strips
1 board added, Wi-Fi.
Drive C is 80G solid drive plus 2 1Tbyte hard drives partitioned to 2 & 3 sections.
Super Multi Blue BD drive with R/W capabilities.
Nothing else.

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