No video input

just normal surfing my screen goes black and i get a floating no vidoe input i am using a nvidia 7300 i have to reboot by unplugging mains electric to reboot
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More about video input
  1. Welcome to the forums!

    Please list all your hardware.
    I am interested in particular about your power supply.
  2. Is the computer still on when the screen goes black?

    Have you tested another video card in the computer?
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