Make sure the power plug is not plug in. Clear the cmos again and remove the battery too for about 2 or 3 mins.
I don't know if this will work. You can and try to kick in the backup bios. Turn off the computer by the power switch on the PSU. Then hold in the power button and than turn the computer back by the PSU power switch. Keep holding in the power button till the computer boots and than shuts down. Turn off the power switch again and wait about 1 min. Then turn back on and try it.