Try replacing the power supply and see if that fixes the issue. If a separate monitor works fine, then it could mean the power supply is bad on the original monitor. Even with nothing connected, you should be able to bring up the monitor menu. Try connecting a different monitor if you have one. If still you have a blank screen, then this could mean there is a problem with your monitor. If the monitor is on, but nothing is showing up, try to press the menu button to bring up the built-in monitor controls. If the light is on, the monitor is on and you should see some message. Check to make sure the monitor is turned on, which is usually indicated by some kind of light on the power button itself.
You’ve probably already done this, but it’s still always worth mentioning because it happens more often than you would think.
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