Compaq BIOS setup
Reboot the machine. When the company name, Compaq, displays in big red letters on the Presario's screen, a cursor should appear in the upper right hand corner of the screen. Press F10, and instead of booting normally, you should see the setup screen for the Compaq's BIOS.
BIOS/POST failure troubleshooting references
I've got a motherboard I think a dead power supply may have taken with it. @@ TODO: Hoping one of these will help me find a solution: