How to turn pc monitor on after holding monitor power button

[Dominic Triplett]

I was on my computer and a lock symbol appeared so I looked it up to find to get rid of it and got the wrong button confused with the montior power button and held it for 10 seconds and now it's powers on normally but it just shows a black screen no matter how many times I press the power button it just remains black. Any help would 100% be appreciated.

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