Before you pressed the CMOS_SW button, did you unplug the CPU and ATX power connectors?
If you didn't, you probably killed your mobo.
This is copied from the manual for your mobo:
"Q: How do I clear the CMOS values?
A: For motherboards that have a CMOS_SW button, press this button to clear the CMOS values (before doing this, please turn off the computer and unplug the power cord)."