I have a standard build HP Pavilion a220n, and my computer is running Windows XP. While I was running Mozilla firefox, my computer screen decides to go completely blank and the blue light on the start button shuts off. I have tried pulling the power plug out of the computer and letting it sit; however, when I turn the computer back on, it doesn't even show the HP logo. I am thinking that this could be a hardware problem, but I'm not 100% sure. Also, I have tried putting in the windows recovery disc, but I can't even get to the system bios screen to set the computer to boot from the disc. Any help would be much appreciated!! Thanks.