Coolermaster 500 PS
Intel i5 processor
Dedicated PCI graphics card Force 30 (ATI?)
Boot cycling within seconds of pushing power button. Continues even after unplugging PS.
All connections to the motherboard have been double checked and cleaned.
The case has been ruled out (booted without the case by shorting power switch pins).
We have tried different processors with the same result.
Power supplies have been changed with same result.
We have tried resetting MB with jumpers and diagnosing using error display with front LED and beep function. Either it doesn't have time to beep/display error message or it isn't detecting any error.
The motherboard has been replaced once before and we are skeptical that we got two damaged motherboards in a row from the manufacturer.
One final idea: is it possible that there is a structural incompatibility between our motherboard and case that is causing a short in back of the board once it is installed? Has anyone heard of this happening?
Any thoughts on this situation or ideas regarding potential troubleshooting techniques are much appreciated.