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A personal computer that resides in one location with its core components inside a case separate to third-party peripherals required for operation, such as a mouse, keyboard, and monitor.

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Computer lights and fans turn on but nothing happens to the screen

After replacing my old power supply I put an old 250w PSU in until I get a new one. Before I put everything back I I tested to see if it would work and it did. But once I tried connecting a monitor to it I realized that there was nothing on the display. I had tried everything of my ability from onboard graphics to a different video cards, nothing was working.

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Try these:

  1. Don’t hot-plug the monitor.
  2. Try removing peripherals one by one.

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