Wireless Dell Windows 10 powers on but screen blank.

[Lorie Kay]

Windows 10 wireless Dell computer. Turned on via power button but screen is blank. the last time I used the computer, accidentally turned the power off before closing the program I was using. I have turned off the computer, unplugged power source, waited 30 seconds, still nothing. I see there are 3 buttons above the power butt, not labeled, & have pushed those (possibly pushing one of those by mistake when I turned the computer off. ) still nothing. Hope you can help!

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