"Check Signal Cable" Error

Hello,
today i came back from geek squad and got a power supply and graphics card installed, when i started my computer it says "Check Signal Cable" i need help and how do i fix this?
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More about check signal cable error
  1. Make sure the cable is plugged securely into monitor, and gfx card at the other end,
    uninstall old gfx drivers and install latest ones for new card,
    make sure its enabled in device manager as well.
    I'll check back later
    Moto
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