Anybody can help me out..

I have 5 12GPU rigs ,

1 of them  i keep frying mobo's .. i have tried everything..

Tested all parts sperately all seems to work
however  the minute i attach my PSU's to the motherwboard whilst I have GPU's and risers powered , even without plugging the PCI's in the MOBO.

It instantly fries my mobo...

I have fried 4 motherboards already trying to trial and error...


it used to work before though...