Asus m2n68-am turning off after 5 seconds I swith on the system

[vinaymallaya]

asus m2n68-am turning off after 5 seconds I swith on the system

 

[clutchc]

Try it with the board outside the case, just the CPU/HSF, memory, monitor/on-board video, PSU connected. Momentarily short the two pins on the motherboard that the case's power switch would connect to. The system should start. See if the problem still persists. If so, I would say the board is bad.