The pc will not initialize the screen

Hello,Last night I changed the power pack on my Hp compaq and since then the computer will not initialize the screen every thing else appears to work but this any answers please
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More about initialize screen
  1. Are you using on-board graphics or a discrete graphics card?

    Are you certain you got every cable plugged in and fastened securely, including the 4 or 8-pin CPU power cable?

    Have you tried removing and reinstalling your RAM?

    Have you disconnected everything, then tried booting with only the CPU, 1 stick of RAM, and the video card installed?
  2. reseat everything

    also make sure you connected the 4 pin aux power connector usually up top left of the mobo/cpu etc
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