My pc is booting and startingup but suddenly display gone but my i/o devices and

when i press power button the pc starts but some times when i press power button display is gone and nothing on the screen when this occur it is not starts immediately to again start the pc i need to completly remove the power and wait for more than 1/2 an hour

can any one help me what is happend to my pc
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More about booting startingup suddenly display devices
  1. Sounds like your power supply is failing. Time to replace it.

    Good luck!
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