So I've just received my gtx 980ti in the post (also upgraded my psu to a 1050w). I've removed the drivers for the old gpu, installed the new GPU and the computer won't post (tried it without the GPU and it boots fine. And it works with my old GPU). Is the card DOA or am I missing something? I've tried switching between them multiple times so I'm sure all card must be seated and all cables connected properly. Any pointers?