Hey guys,My pc starts and the windows 7 startup sound comes from the speaker but nothing is visible on the monitor ..........i have to restart it several times and it takes almost 10-15 mins till anything is visible on the screen..........monitor says it is receiving no signal.....My monitor is OK i have checked it......I had integrated graphics so I bought a gpu thought it would help but the problem still persists........I have a 450W PSU......i have tried many thing like clearing bios etc.