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Laptops often have a function key which switches from laptop only, external monitor only, laptop & external. One of the top number keys, along with the function (fn for short) must be pressed simultaneously to step through these.
Where these keys are at, may differ from laptop to laptop.
this is not a pc problem... this is because the connection loss between pc and monitor... not all pc's have sleep mode in externa vga connection.... it just cuts power off... u can configure monitor of possible to do that..
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 its going to analog power saving mode, that is what its supposed to do when it does not get a recognizable connection from a computer vga port. I would suggest coming back on with some more information about your computer and suggest testing another screen on your pc.
Most screens will show nothing or go to power saving mode until the PC is turned on. The monitors need a signal in order to be 'active'. From your description it could just as well be a problem with the PC rather than the monitor. The easiest way to find out is to connect another PC or laptop to the screen or connect another monitor to the PC unit.
Did you try pressing the Del key or F2 key when you turn on the unit to get into the Bios?
Try going into your Start Menu then going into your control panel...then clicking on your "power options"....then switching the options to 'always on'..if this does not work..(as it seems you may not be seeing this because the monitor is in power saving mode) try fiddling with the setup option on your monitor and find a possible powersaving mode enabled function and disable it. every monitor is different so I couldn't really help you here...if this doesn't yield results try another monitor to see if it's the monitor having the problems or the computers video card...the video card could very well be the culprit...
I had this problem as well as a lot of other people. The solution is to go to the power options in the control panel and turn power saver off. This should keep the monitor from going into power saving mode.
-Turn off both computer and monitor
-unplug monitor from computer(still plugged into power supply)
-turn on computer and monitor(monitor is still unplugged)
-After computer is on for about 30 sec. plug monitor into computer
-turn off both monitor and computer(now connected together)
-turn on monitor then computer and should be good to go!!!