Hi, my old computer had a terrible onboard graphics card, I went out and bought a Gigabyte Radeon R7 260x and a new Corsair 430w power supply, stuck it all in a new casing etc with my old motherboard and CPU as they are still quite decent. Had a bit of trouble initially getting it running at first, tried everything to get a picture on the gfx card and it wouldn't happen. about an hour later I turned it back on and it booted up from the gfx card fine.. even though I had tried nothing different to when I had turned on the other 10,000 times that day. Ran absolutely fine all night, amazing graphics, fps etc.. turned it off when I went to bed, woke up the next day to it wouldn't give any video output again. The onboard graphics card still loads as normal when the video input is attached. Not sure what's happened considering nothing changed at all from when it was working fine last night? Any ideas please?! literally tried everything and I'm starting to run out of ideas!!! nothing logical seems to work!