My son was playing a game that he downloaded .An informtion box appeadred saying unable to set graphics.the game then came up and he paye it for 30 minutes. he then closed the game and logge of .next morning the screen was very dark and faintly showed what was on the screen. The laptop was switched of and turned on again ,the scre remains darkbut one can percieve that te screen showc the stuf that's on it but barely so.
Push the Fn and F4 the same time you will have the screen back
You have lost the lcd backlight, probably the backlight power supply, this is very common. What type of laptop is it?
lcd connect to laptop 
inverter
lcd screen replacement 179 views
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own a hp notebook and have no backlight. the strange part is that I plug an external monitor and the screen works for a couple of seconds and then loses its signal! the rest of the computer appears fine and the screen on the laptop is visible that it still works even if really dark. having gone through a few forums it seems that the inverter or the backlight is potentially the culprit! will take it back under warranty and I will let everyone know what the outcome is!
This question is to the guest that posted a solution to a big problem with a very simple fix(Fn & F4)!
i have already sent the computer for warranty repair. But somehow i would feel really stupid if it was something that easy! Could you please elaborate what the Fn & F4 do to the computer that makes the screen work for future reference! Some of these simple fixes could help a lot of people out there and also save themselves expensive fixes.
thank you for the help.
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