sg55,

According to your motherboard manual, here is an explanation of beep codes: http://download1.gigabyte.ru/manual/motherboard_ma nual_ga-g31m-s2l(s2c)_e.pdf.

See Page 79.
Q: What do the beeps emitted during the POST mean?

A: The following Award BIOS beep code descriptions may help you identify possible computer problems.
(For reference only.)

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

You could try and reinsert the graphics card and reattach the monitor.