To clear CMOS in S2QR6/S2QE6, please first find out the DIP switch SW2. Second, you must turn off the system, unplug ther power cord, and set SW2 #4 to "ON" for about 5 seconds. Then turn SW2 #4 back to "OFF". The CMOS now is cleared, and you can plug the power cord back in to power on the system.