I have a OCZ modxstream 500w psu connected to the above mobo but it won't power up .
The psu wiil start up if pin 4 is connected to earth but not when it connected the mobo even if pin 4 is
held connected to earth.Any known incompatibility between the two?
The motherboard won't poweron without RAM and a CPU installed. Also you have to have both MB power connectors attached.
Sorry perhaps I used the wrong term. Should have said the PSU won't switch on. All my previous mobo's would at least turn on the psu before having the other hardware connected. I do this as preliminary check.
Perhaps this mobo is different