There are ways to reset the BIOS: The most common way is to remove the Battery for 30 seconds to 2 minutes (30 usually works fine).
To remove the battery: Open case, locate the small silver circular thing (looks like a watch battery) typically near the PCI slots, and remove it for the time frame, then re-insert and start PC. Always be sure to ground yourself first.
Edit: Also, best to make sure you unplug the comp first.