I bought a nvidia gtx 970 and installed into my pc It I the. Started up my pc and it all worked I then proceeded to download my drivers for the gtx 970 once that was done I went to the device manger and disabled my old intergrated graphics card no realising it would not enable the new one now I have a black screen and I can't do anything I also took the cmos battery out and left it out for around an hour and put it back in and still a blank screen. I would really appreciate any help