My PC seems to be overheated as whenever I use any DVD-Rs, they come out warm to the touch. So, I sent in it to have a new fan installed. Now, my PC screen keeps ‘blinking’ – it goes on and off, and I get a black screen every few seconds or so. It’s worse when I open a webpage with many pictures on it. It seems to go blank each time a pic. appears. But even when I am not on apage with pics, it sometimes goes black, too. It's quite unnerving. I scanned it with Norton and Iparmor - no virus nor Trojan detected. Please help. Thanks a lot!