I built a PC for a friend of mine, I've had to replace the graphics card once in it as it finally died (he specified it was for no gaming apart from minecraft, I threw in an old 9800GTX, he started playing BF3 and new releases on it for a year!). Anyway, he's now informed me that he is no longer getting a video output. No monitors recognise it on any connector, but he is getting a normal POST beep. Any ideas before I ride over there and take a look?