My monitor is connected to a VGA port on the motherboard and I have tried two monitors, a LCD and a CRT. Both monitors work on my other PCs, so it’s not a monitor problem. I also tried resetting the BIOS by removing the battery on the motherboard for at least 5 minutes, still no luck. My PC had this very same problem in April 2010 and it was under warranty at the time so the folks at best buy fixed it and said it was caused by a graphics card failure. What is new this time is that the OS would crash more frequently all the time with a blue screen event titled “Bad Pool Header”. It got so bad that I had to reinstall the OS every day to use it, until it stopped working altogether. I read somewhere online that the “bad pool header” event was caused by malfunctioning RAM, is that true? Should I replace all 8GB of my RAM?