I recently bought an ASUS P4P800, along with a pentium 4 HT running at 3.0 ghz and two sticks of 256 mb. DDR ram. Everything seems to fit fine, and I'm pretty sure I installed everything correctly. But when I boot up all I get is a black screen. I cant even access the BIOS. If anyone has any idea of what could be wrong please let me know as soon as possible.