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Check Menu on screen and look for "Brightness". Change setting to 100% or whatever setting works for you. If it is already at maximum you do need to replace it. Some monitors do (eventually) "burn out".
this thing happened in my laptop also i got green screen fully then when i hit it behind the screen it was gone but comes many times then again i would hit later on the screen was completly lost then had to replace the screen yous is a starting period so go to a nearby computer service and fix the screen
Sounds like the backlight is going out. Youĺl need to replace the LCD screen. You can find them on ebay. Just make sure you purchase the correct one for your laptop. You will need to take out the screen to see who makes it and the number. Go to dell.com/support to find your manual, if you feel like you can do it yourself.
Fn> + <End>
Mutes the speaker
<Fn> + <Page Up>
Raises the sound volume
<Fn> + <Page Down>
Lowers the sound volume
<Fn> + <F10>
Ejects the drive bay
<Fn> + <Esc>
Places the computer in Suspend Mode
<Fn> + <F7>
Alters the font size at boot. If the Dell splash screen or Windows splash screen is very small, then this will enlarge it.
<Fn> + <Down Arrow>
Dims the backlight on the LCD
<Fn> + <Up Arrow>
Brightens the backlight on the LCD