If you had it plugged into a monitor or were using the svideo before you turned off the laptop, just right click and the screen should turn on in a few seconds it still thinks its connected to another display
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Re: SCREEN DOES NOT TURN ON
Try hooking it up to an external monitor, if you get video chances are it's the lcd and not the video card. Also try turning up the brightness on the keyboard to see if you get a very faint picture. Report back with the results.
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Shut your computer down and turn it back on (not restart, turn it off) while its coming on, rapidly hit the F8 button until the black screen with the white font appears. Stop hitting F8, and select Safe Mode. The computer will start up with the minimal functions to operate. Now, run your antivirus program, what ever it may be. When it's done, shut the computer off and turn it back on, unless the computer tells you to restart. Then try to log in again.
I am assuming you have plugged the screen into a known working power source. You have pressed the 'on' button to turn the screen on and you have hooked up the screen to the back of the computer. What I need to know is if when you power up the computer if you see any text at all from the post AND if you see any lights on the front of the screen itself. (most all screens have lights on the front of them to tell you they are turned on, and most of the time the light is green). If the screen is on but is getting an orange or amber light that means something. Also if you see text or something on the screen initially but not in windows then it could be a resolution or driver issue.
there is an inbuilt hardware diagnostic..
turn the computer off then hold Fn + power button to turn it back on.. it will automatically initiate PSA diagnostics.. will beep and ask you if u see the colour bar displayed.. if u see them respond accordingly or else.. let it run.. within 10 minutes you'll get an error if its hardware glitch.. call dell tech support at 1800-624-9896 and tell the error code.. they will replace the lcd kit by sending a tech at your place.
You need to try to log into safe mode. if its running win xp please hold the f8 key down and it should prompt you to go to safe mode. If safe mode lets u in all the way. you need to update your video drivers.
by shutting the screen you have activated power saving followed by hibernation.when you lift screen and press power a screen appears telling you what programs are currently running and your icon to enter.by removing battery you have (computer term) illegally shut down,possibly with programs running,which incidently is a good way to loose sys32. which would require a repair or install.
Not ur case as of yet.restart ur pc and press f 8 about 4 seconds later .black screen with options appear ,navigate to start windows with last good configuration.windows will restart with last good settings .
if you choose to go asleep whilst a program is running you can configure windows not to go into power save mode or hibernation,turn off hd,turn off pc etc .
if you right click mouse in any space on desktop,select properties,screensaver,power.....you can change settings there to suit.