I don't think this is a BIOS problem either.
Open the case and disconnect everything that is not mandatory (Hard drive, CD-ROM, even remove the video card and try with integrated graphics, disconnect every other peripherals, etc...). Try to boot with minimal components and see what happens.
You can also remove power from every components for a while to reset them properly, especially the monitor. I had a monitor once that had a defective DVI port and when it failed to display something (no video signal) the only solution was to disconnect power from the monitor wait for 10 seconds (or more) for the capacitors to empty and reconnect it.
As I said I don't think this is a BIOS issue, but if you changed a BIOS settings prior to the problem, you can also remove the CMOS battery from the motherboard, wait 10 seconds and put it back and reboot. Doing so will reset BIOS settings to default.