The easiest way to reset BIOS is to power down, remove the power cord. Open the computer and remove the CMOS battery. Press and hold the power button for 10-15 seconds to let all the caps drain.
Put the CMOS batery back, connect the power cord and power on.
You should get an error message about CMOS check sum or parity error, press F1 to enter Setup, F2 to continue, or something like that. Go into setup, change CMOS settings, save and exit.