Computer turns on then shuts off.

September 13, 2011 at 07:08:44
Specs: Windows 7 32bit, Amd phenom x4 955/8 gigs
I just recently replaced my motherboard and video card (motherboard/video card failed) and after running the system for approximately 20 hours, the system will power itself off as if the power was suddenly removed. I checked to make sure the connections were good and it would not restart, but after I removed the power cord and pugged it back in, the system would start up to Windows. It staryed happening while I was on facebook, but instead of powering off it would just restart, now it only stays on for a few minutes. I suspect it might be a power supply issue, but I am not certain since I do not have any test equipment. My system components are as follows:

Motherboard: Gigabyte GA-970-UD3 AM3+

Video card: XFX Radeon HD 6870 2GB video ram (not overclocked)

CPU: AMD PHENOM II X4 955 black edition 3.2G. (not overclocked)

Power supply: Corsair 750 watts

Memory: Gskill DDR3 1600 (8 gigs)

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September 13, 2011 at 10:01:22
When you replaced the mobo, did you reapply a coating of thermal paste to the cpu? are a ll the fans and vents free from dust. It sounds like an overheating problem. I see you have 8 gigs of ram installed on a 32 bit system. That means 4 gigs or more are just sitting there. You need the 64 bit version to use that much ram. Try removing 4 gigs and see what happens also. Try running memtest on the ram also.

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September 13, 2011 at 10:47:14
Thanks for the response! Yes I did apply thermal paste when I switched the motherboard. When the system is running, all the fans are running normally, if the CPU or video card does heat up I do notice the fans increase in speed. Also my case is a full size AZZA which has a 140 mm fan on the side (blowing air into the machine), a 140 mm fan on top (blowing air out of the system), two 120mm fans in front blowing air into the system, and one 120mm fan in back (blowing air out of the system).

I also have a 64 bit version of windows 7. I have two seperate hard drives (one is a 32 bit version of Windows7 while the other is a 64 bit version of Windows 7). I did that just in case any problems developed. Also I experianced the same issue with the 64 bit version as wll.

One other thing I did notice was that when the system does start upthe Gigabyte application "easy tune 6" asking if I want it to make changes to the system, I just select no since I have no intention to overclock.

Additionally, I also noticed when I was double checking my connections, one of the heat sinks on the motherboard seems loose. It not the one on the northbridge, but located between the CPU and the rear connections. Thank you for your help!

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September 13, 2011 at 11:58:16
No heatsinks should be loose. It might be the problem, I really don't know. Good Luck.

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Related Solutions

September 14, 2011 at 07:22:30
Thanks for your help! I contacted Gigabyte and they concurred that the problem eas probably the motherboard. I contacted Newegg to swap out the boards, hopefully I will have no other issues. I am surprised a overheating motherboard can create this issue, I may need to modify my cooling setup.

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September 14, 2011 at 20:48:40
One exhaust fan is enough, two is more than enough. One front fan blowing in is more than enough. Side fans may actually reduce the smooth flow of air through the case by creating turbulence.

Make sure you clean off all remaining old thermal compound and Look here before you reapply:

Check temps with Speedfan or similar after a new build to make sure your cooling set up is operating efficiently.

You have to be a little bit crazy to keep you from going insane.

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September 15, 2011 at 08:32:46
Thanks for the info. I will turn off the side fan and see if that makes a difference, but I will leave the top fan on since it is used as an exhaust I do not believe that it will hurt. Also I reviewed the link you provided I already isrd the arctic clean 1 and 2 (that stuff works pretty good) and I will try the tinting since I did not do that before, I just cleaned the old paste off and applied the arctic5 compound (about the size of a pea). What I noticed before I started having the system shutdowns was temps in 42°c at idle using the bios (easytune 6).

When I took off the heatsink and then CPU for shiping the motherboard back for an exchange was that the compound appeared reasonably spread since there was a little bit of compound spilled over on all four sides of the CPU by a small amount. But since I had to twist the heatsink off the CPU it was hard for me to tell how even the spread was.

Again, thankyou for the advice and help!

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