H81 pro btc r2.0 not presenting anything after I connect a GUP

Today I receive H81 and I cannot get any display when I connect a GPU.
When I tried to turn on it gets stock in a black screen which I cannot find a way to get rid of. when I disconnect all GPU's and use the embedded graphic card everything is normal.
Is there something I need to change on the bios?
Please help.
Any suggestion on how to fix this problem would be highly appreciated .