I recently built my first computer, things were working fine for a couple of weeks but now the graphics card sometimes doesn't work. The monitor won't recognise the input (I have switched monitors and cables so it is the card/motherboard). I opened up the PC and pushed the card, and it did work for a while but then stopped again. I've now completely taken it out and put it back in, and it's working. Hoping this doesn't happen again, but if it does is there any common things I could do to troubleshoot the problem or try to fix?