When I switch my pc on the POST appears to start but I get no picture on the monitor and the pc just does a 3 sec bleep then quite for 2sec and then bleeps agains for 3sec and this continues. I have tried starting up the pc with F8 pressed, no difference. If you press the DVD drive eject the draw opens. I took the cover off & the CPU fan is spining as normal. I did have this bleeping noise once before when my hardrive went faulty, I can feel the hardrive spinning away, so I tried unplugging it & but it made no difference. Any idea what to do. I thought it might because I had accidently left my pc on overnight and all day, so I switched it off and since then it wont fire up.