Computer Reboots Unexpectedly

July 5, 2011 at 15:56:03
Specs: Windows 7, i7 950 Processor LGA1366 3.06GHz / G Skill 8G(4x2G) DDR3 2200Mhz PC17600
I have a reasonably highend computer that I built a few months back and the system has never really been reliable. The system appears to run fine, then after about 40 minutes the machine power cycles. Once the power cycle starts up again it never completes a full reboot and the power needs to be turned off and allowed to sit for a period of time before I start it up again.

The computer specifications are as follows;

1 x CoolerMaster NV-942-KKN1 HAF942 nVidia Edition No PSU
1 x Asus Rampage III Formula Socket1366 X58 6xDDR3 3waySLI CrossFire RAID
1 x Intel Core i7 950 Processor LGA1366 3.06GHz 8MB Cache CPU
2 x G Skill 4G(2x2G) DDR3 2200Mhz PC17600(4GBPIS)
1 x Asus EAH6870 PCI-E 2.1 1GB GDDR5 DVI HDMI D-Sub DP DX11 Fan
1 x OCZ 120G Vertex II SSD 3.5
2 x Western Digital 2TB Green 64MB SATAII WD20EARS
1 x CoolerMaster 1000W Silent Pro Gold Modular

I have conducted the following tests thus far;
- Checked the bios to see that everything appears to be within normal temp ranges
- Run a MemTest86+ test, but the machine rebooted after the test was 60% complete

My next steps will be to pull out the memory sticks and try testing them individually.

Any advice would be great.


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#1
July 5, 2011 at 18:00:20
Never been reliable means one of three things.
One is some hardware/firmware issue that can never be fixed by any amount of diags.

Another is bios settings. They may be off for your hardware. Be sure you know what you bought and the settings the bios HAS to have in order to be stable. Know what settings might be used to improve stability also.

Lastly is software.


I'd start with the bios and then run some diags. Run memtest and hard drive diags to being with.

1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.


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#2
July 5, 2011 at 18:13:37
I have checked that all componentry is compatible from a motherboard perspective.

The BIOS in use is 0702 which from other posts on the web is supposedly stable for my hardware.

The strange thing is that even when I tried to run the memtest last night it did not complete and the machine started its reboot sequence again.


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#3
July 6, 2011 at 13:18:12
Then you know what to do. Work on hardware diags. Consider any part from psu to cpu and memory.

1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.


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#4
July 6, 2011 at 14:29:01
Ok, so last night I took out 1 stick of RAM from the MB and the MemTest worked a treat. I then went into the BIOS and things all looked pretty good from what I could tell. After running outside of Windows for nealy an hour without issues.

Then as the machine booted into Windows the machine started to reboot again. This vicious cycle does not seem to be ending. So, frustration is setting in once again. I guess I will take another crack at it again tonight.


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#5
July 6, 2011 at 17:51:57
Look at event logs to see why it is rebooting. I guess you could have a virus already.

1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.


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#6
July 12, 2011 at 17:23:52
Ok, so I upgraded the PSU from 650w to 1000w in a hope to rectify this issue, but still no joy. After about 45 minutes of running time the system continues to reboot over and over again without getting back to windows.

It has to be a hardware fault. But what could it be CPU? RAM? Video Card? or newly replaced Motherboard? The mystery continues...


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#7
July 20, 2011 at 21:24:36
Ok, so I have successfully ruled out the operating system as being the culprit. So this leaves, CPU, RAM and Video Card as the last possible point of failure.

Just a quick note; there are no errors appearing in the event logs other than "System shutdown unexpectedly" no further information available.


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