From the manual in section 2.2.6 "on board LEDS" it says when one of these lights is lit it indicates a problem during POST. I would suggest at first to make sure all your physical connections are made and are secure. Make sure the power supply connectors are properly connected to both your 24 pin power connector and 8 pin power connector. Check and make sure you cpu is properly placed inside its socket, and that the heatsink is properly installed as well. After you hardware check try and update the BIOS. System stability is marked under that motherboards current BIOS updates.
Good luck, hope I helped a little.