Question : Problem: My new mother board cannot boot up.

The model is MSI IM-GM45.

The cpu is Q900, which is confirmed from MSI by email.

But when short the switch of power supply, only the cpu fan is running, totally no video output. I changed 2 LCD monitor, 2 video cable(DVI, VGA), totally no display.  Tried 2G memory, 4G memory.

Sometime, when bootup, after a few seconds, the cpu fan will stop and start, and the board seems auto-reset and start again.

Any suggestion. Thanks.

Answer : Problem: My new mother board cannot boot up.

Sounds like a production fault maybe? I would send this board back to the shop you baught it from for possible testing and refund if I were you.