MOBO fails start

buccy

Honorable
Jun 16, 2013
7
0
10,510
have a asus m2n- sli deluxe mobo, fails to start after post (5 secs)
replaced power supply, same fault any ideas?
 

buccy

Honorable
Jun 16, 2013
7
0
10,510

just cleared it comp starts now gave a mem warning, sorted out mem now attemting to build components into case
Got the system running, now after bios settings are done getting a warning( USB over current detected, disconnect device system will shut down in 17 secs.
NB no usb connected to board?