When i switch on my pc it reveals 3 beep sounds and the display is not seen

when i switch on my pc it reveals 3 beep sounds and the display is not seen. but my monitor works good. Could some one pls help me.
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More about when switch reveals beep sounds display seen
  1. Most likley your memory is bad, not seated properly or another RAM issue.

    Check your memory.
  2. Ensure RAM is in correct slots, if applicable to your MB....(usually 4 slots, color coded, reference your manual...; drop to single stick in required slot at least until you can get a good POST)

    Ensure video card is fully seated in it's slot (with power off/removed from PSU if you are going to be reseating it), and has it's PSU power inputs connected....
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