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Accidentally turned off monitor

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Hello, anyone who can help....I was trying to adjust the settings on my monitor (dell laptop) and clicked to disable the device, now the computer starts up but the screen is blank. How can I enable the monitor again??? If it matters the process I used to do this was Control panel>>Display>>Monitor, then at bottom of window was option to disable (it was enabled, of course). Computer restarted went to start up screen but no image. PLEASE Help me!!!
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A couple possible ideas, but I do not know if they will work.

Try safe mode and if you get a display you might be able to do a system restore to a previous time. or,
Hook an external monitor to the laptop and see what you get.
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Hi Oppsagain,
I agree with Runner's recommendations.
When you first turn the computer on, does anything display at all, or is it completely blank from the moment you press the power button?

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Suggestion for you to try which should enable you to restore factory settings;

1:Restart your laptop,
2:Press "F2" during the boot process to enter the BIOS, certain models may use a different key, the key will be displayed during the boot process, for most Dell models the key is "F2."
3:Use the "Alt" + "F" key combination to load defaults.
4:Press "Esc" on your Dell laptop keyboard to save and exit.
5:Choose the "Enter" key to save all changes and exit the BIOS screen, allow your laptop to restart for BIOS settings to save.
Let us know if this helps.
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