How to fix a computer that turns on but displays nothing

am using this dell optiplex 2080 and i turne it on it displace noting but the power is on,and the prossesor ges boot fast and notion comes on the screen.dont no why.
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More about computer turns displays nothing
  1. do u hear a "Beep" when turning on the PC ?
    if so check ur Cables , if not try Clearing CMOS
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