I recently acquired a Gateway 507gr with an Asus P5GC-MX/1333 and my uncle said that it had a bad psu. So i went out to Microcenter and picked up a 500w psu, vga cable, and a wifi card. I go home and swap out the psu's, hook up the vga cable to the monitor that i was also given, a samsung syncmaster 512n, and plugged in a ps2 keyboard then proceeded to turn the baby on. As the pc was turning on the keyboard lights flashed twice and the bios splash screen appeared. I tried hitting delete and tab to enter the bios, but no response. I've been trying to fix this for the last week by googling and searching non stop. I've reset the cmos battery many times but when i do the pc freezes on a page about American Megatrends, which turns out to be the provider of the bios. Usb keyboards don't work either. I don't have a speaker on the motherboard so i can't hear any beeping if there were any. Please some one help me.