I first had an overheating problem with my graphics card so I took it to a shop that cleaned it with compressed air and then relayed the thermal paste when I brought it home I plugged it in and nothing was appearing on screen. I then realised that my psu fan wasnt spinning. I purchased a new one and it has now arrived but this time everything turns on I can open and close the cd rom but still nothing displays on screen and neither does my computer hit post. Please help me!!!