Looks like the psu might be bad
Here are the error codes from your mobo manual
1 short: System boots successfully
2 short: CMOS setting error
1 long, 1 short: Memory or motherboard error
1 long, 2 short: Monitor or graphics card error
1 long, 3 short: Keyboard error
1 long, 9 short: BIOS ROM error
Continuous long beeps: Graphics card not inserted properly
Continuous short beeps: Power error
Edit: The manual doesn't say any more than 'power error' I guess it could mean it is shorting too. Have you tried building outside of the case to check for shorting?