Solved My compuer cycles on and off in split second cycles.

The motherboard is a MSI P55-GD80 CPU is i7 880 3.07 GHz : Windows 7 64 bit: memory 8 MB.

Derek August 15, 2016 at 08:17:08

If you restore everything and set Win 7 not to restart on failure the blue screen and error message might give a clue. Seems like the only thing left is the motherboard itself. Always pop back and let us know the outcome - thanks

btk1w1 August 15, 2016 at 16:05:48

Try bench testing the board. If you are contemplating a replacement all the necessary components will need to removed anyways. It's not much more effort to remove the PSU. When you go about removing the motherboard try keeping a close eye for anything that might be causing a short, such as an additional standoff that shouldn't be there or a screw that may have fallen behind the MB and become lodged. Also check for any physical sign of damage to the motherboard. Scratches, bulging capacitors or excessive dust buildup in the slots and around the processor and heatsink / fan. If you can get the system working outside the case check inside the case for something that could be causing the issue. Something that could be causing a short or even the wiring that runs to the power switch. Bench test a motherboard: http://thenerdbench.blogspot.com.au...

sluc August 15, 2016 at 19:03:26

Have you tried resetting the BIOS? (remove coin battery)?

DAVEINCAPS August 15, 2016 at 21:37:07

Did anything happen to it or did you make any changes just prior to this behavior starting? I don't see how you can determine it's doing this in 'split second cycles'. It takes much longer than that for drives and fans to spin up and down. But I agree the motherboard seems most likely since that's all that's left.

riider August 16, 2016 at 06:27:24

✔ Best Answer

"I have removed the sound card, video card, installed one memory module at a time, replaced the CPU, the power supply, disconnected the hard drives and the disk drives" Sound card? Why would you even use a sound card on such a board? https://us.msi.com/Motherboard/P55G... A cheap or overloaded power supply will cause random reboots, as will an overheating CPU. You provided no info about either the old ones or the new ones. When replacing the CPU, it's very important to install the heatsink properly & with the correct amount of thermal paste. The i7 uses the vertical line method. http://www.arcticsilver.com/pdf/app...

OtheHill August 18, 2016 at 05:40:23

Is this a new build, or was it running correctly before?