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Reboot the computer in Safe Mode by pressing F8 at boot up and selecting Safe Mode.
Then go to Start->Control Panel->Keyboard. Here you will find settings of this keyboard. Disable the sleep mode. And your monitor will come alive. Whenever you have any problem you must first use the control panel and try your hands at DIY. But do remember what you did in what sequence to undo it later if need be.
Dell monitors automatically go into power-save mode after a preset
amount of time when the computer is inactive. The Dell monitor will go
completely black, instead of showing a screensaver. This doesn't mean
that your Dell computer
has shut down. Instead, this allows your monitor to essentially turn
off until it's needed again. You can change how long it is before the
Dell monitor goes into power-save mode by changing your display
any key on your keyboard or move your mouse. Either will turn off
power-save mode. Alternately, you can press the power button on your
Dell computer tower or laptop.
any key a second time if the monitor goes from power-save to stand-by
mode. Stand-by mode allows the screensaver to appear.
your user name and password into the login prompt if your computer
requires a login. Press "Enter" to begin using your Dell computer.
the display settings on your Dell monitor to prevent your monitor from
going into power-save mode prematurely. Right-click anywhere on your
desktop and choose "Properties." Click the "Screensaver" tab and press
"Power." Beside "Turn off Monitor," choose a time amount from the
drop-down list and press "Apply."
If you do not move the mouse or press any key on the keyboard it could be just going into video power save. Confirm it by moving the mouse or pressing a key on the keyboard. If the monitor comes back on, adjust the power settings in control panel and change the time for the "turn off display" to a more suitable setting.
This is a message the monitor displays when the video cable is disconnected or the computer has no video output. Could be the computer is simply entering power save mode. Does the screen come on when you move the mouse or press a key on the keyboard?
Hold down the function key on your keyboard (lower left hand side of your keyboard between the control key and the windows key) and the F8 key simultaneously. This cycles through all monitor set up modes.
To disable the sleep button on the acer keyboard Do the following (Vista home)
Go to control panel (classic view) double click Power options.
left hand margin select Choose what the power buttons do.
This opens a systems settings page
You will see an option :
When I press the sleep button: (Don't worry that the picture of the button is different than the keyboard's Zz)
Select Do Nothing from the dropdown box.
Click the Save changes button at the bottom of the screen.
If shutting down your laptop and restarting it didn't work and you still have a black screen on your laptop, You may have to when your computer first starts on the first logo press F2 or delete key until you get into you Bios, Reset Bios to Factory Default setting and press F 10 should save setting and you monitor should be back up and running. If that don't work get back to me, But I think I will work for you.
Just had the same problem... what worked for me was simple. Unplug the cable from the monitor, hit the power button a few times until Dell screen poped up with a few color bars because it knew it was no longer connected to a PC. Then plugged the cable back in and all was fixed.
Ok sounds to me like a power supply problem.. this a a fairly common symptom. I suggest that as a temporary fix you set the monitor to NOT turn the power off to the monitor in sleep mode if possible, in your power settings for the monitor.