I bought a new gpu (msi gtx 970) and my computer refuses to work while it is installed. I power my pc, fans spin, lights light up but I get no video signal from the gpu or from motherboard. GPU is fine, it has been tested in a another computer. PSU is fine too, tested with two different ones to be sure, voltages are fine when check from BIOS. All components should be compatible and my PC works fine with my old gpu (gtx 560 ti). Any ideas what to do? Something wrong with the mobo maybe? PC: i5 3570k - z77a-gd55 - tx650w