How did you stop the first BIOS update? Did you just unplug the system? BIOS updates are risky business, and you stopping it in the middle could have irrevokably broken your system.
Just to try, is the update still ongoing? If not, try to remove the CMOS battery while your system power is off at the PSU. Then hold down your power button for 10-15 seconds, then reinsert the CMOS battery and power back on.