My computer shuts down and restarts continuously. It stays on for about 5 minutes on the first startup but thereafter it reboots repeatedly staying on for about 10 seconds. No BSOD. I have cleaned everything and reseated properly, checked the BIOS temperatures and everything's normal (Actually, CPU temp. once reached 99 before I cleaned the heatsink and reseated it).
CPU: Intel Core i5 760 (Stock Cooler)
Motherboard: ASUS P7P55D-E PRO
Graphics: ASUS Radeon HD 5870
RAM: 4gb Corsair XMS DDR 3
Harddrive: 500gb WD Caviar Green
PSU: Cooler Master GX550
OS: Windows 7 x64
Possible Suspects: Mobo, PSU
Mobo LED is always ON though. And I have tried turning on the PSU by completely disconnecting the PSU and using a paperclip. It passes the test. Does that rule out PSU?
Yes... sounds like an overheat... if you leave it for a few hours... can you run it again for 5 minutes?... the fact that it runs for a bit, then shuts off and does not run for very long indicates something overheated and needs to cool down... Typically its the processor.... did you overclock anything.. That stock cooler is HORRIBLE.. Agree with COLGeeK - did you apply thermal paste to the heatsink after cleaning it?
That temp the processor reached may have damaged it, but I am not really sure... mine got to the 90's once during overclock testing but did not cause any permanent damage...
Yes and no... i would say to try a BIOS update, but that may fail during updating and "brick" your mobo... Can you run a stress test? Like booting to PC Check and run a stress test and see if it fails quickly? Check temps in Windows using a CPU Temp program or something.