Unable to boot - no monitor

The monitor was displaying message 'dpms off mode' and would not boot. I have replaced the AGP video card and cleaned the inside of the PC of years of dust.When I turn on PC there is a constant buzzer sound, the ram_led light is on, there still is no monitor. The system is a Gigabyte motherboard GA 81PE1000, I cant give much other information as I can't get in.
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More about unable boot monitor
  1. unplug Ac power from PSU, remove your VGA AP, try use VGA onboard
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