I have just purchased a new gigabyte r9 390 g1 gaming to upgrade from my HD7970 however my pc won't boot into windows if it is in the pc. I removed the old drivers and installed the new ones but it will not boot if the new card is in the pc. I can plug the old card back in and it works fine again. Also if I have the new card installed I can't even run windows through onboard graphics or in safe mode it just goes to the 'loading operating system' screen then resets. Im running a i7 2700K in a GA-Z68XP-UD3 with an 850 watt PSU. Does anyone have any suggestions?