It won't boot after i changed my GPU but it works if i put my old one in. these are my specs:Corsair TX V2 750W PSU, Intel® Core i5-3570K Processor, XFX Radeon HD 7950 3GB GDDR5 (<< old GPU). And i wont work with my gtx 970 and i've tried everything except formatting and updating bios because that's a pain in the ass.