Generally speaking, when you start a computer, the monitor will also turn on for working.
However, we recently find many people saying that their monitor won’t turn on as usual.
The computer turns on after pressing the Power button, but theres no display on the monitor.
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How can this problem be fixed?
In general, your monitor will turn on after you started a computer.
However, problems may occur during this process; some people said theirmonitor wont turn onas usual.
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When finding your monitor not working and getting a monitor black screen, you should troubleshoot the problem first.
Then, start the backup task without delay.
There are some common reasons to explain why your rig monitor wont turn on.

Fixed: Windows 10 PC Monitor Wont Sleep/Turn Off.
Have you ever encountered a corrupted BIOS?
Do you know that the ordinary BIOS corruption can be fixed?
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This post will unveil these things to you.
#1.
Check Power LED Indicator
Look at the power LED indicator on your Dell monitor to know its current state.

On most common monitors, the indicator is located in the lower right corner of the front.
#2.
Check the Power Supply
#3.
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Lots of people are complaining online: my computer screen is black.
How to deal with the situation when your machine screen wont turn on?