try the following:
try first of all to clean the screen using a wet towel because the problem might be that the windex has made a dark layer on the screen ...
if this does not work then if u have a vacum machine that can can get the screen dry by blowing air on it...this might work
if not then you have to send it back to the manufacure
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Have you updated a Graphic driver? Does it Dim on battery and AC? Look at power settings. Control Panel, Power. You could Rool-Back the graphic driver to see if that changes the problem. A Gateway mt6841 has Windows XP OS, right?
The best way to clean it up is with a microfiber cloth VERY lightly moist with warm water. No soap. No solvents. No alcohol of any type. NO WINDEX. NO 409 or any household cleaner. Be sure that if you're cleaning an LCD screen that you apply VERY little pressure, otherwise you can damage the screen.
For an old-fashion CRT screen (NOT A FLAT SCREEN LCD), you can use the same as above or you can use a small amount of water + rubbing alcohol. Be sure that the liquid doesn't drip INSIDE the monitor.
If the cloud like image is black then you have damaged your screen by applying too much pressure on the screen. You should use special LCD screen spray and soft cloth to clean your screen to gently clean the surface of the screen. Replacement :CD screen maybe available for your laptop from this WEB site. LCD screens and Inverterswww.lcdparts.net
Do not ever use anything other than warm water and a soft rag to clean your LCD screen!!!!! Possibly use a little mild dish soap on a damp rag, but make sure the rag is only damp. You have now ruined your screen and most likely will need to replace it.
It is almost certainly the LCD inverter which is the cause of your issue. It ism ore common for the inverter to develop a fault than a backlight bulb on the LCD (I used to work in a Toshiba repair centre).
Replacing the inverter should be simple, just make sure the unit is powered off with the battery removed so you don't get an electric shock.
Hope this helps,
If your have the time, Hose down the pc with windex, through the leyboard, and any other openings that are available. Set the unit aside for at least three days in a warm area. This will dissolve any beer residue and allow the windex to totally evaporate. Try to run the unit after you are fully sure that all of the windex has evoparated.
You should be good to go unless you have burned out the video processor. If the screen still doesn't work, you can attach an external monitor to test it. If it works, you haven't burned up the processor, but you most likely have ruined the screen circuity.
If that is the case, then good luck. Go online and goole Gateway Notebook Repair. You'll have quite a few choices to select from.
Take the computer into a darkened room.
Can you read the screen? Does the text/icon on the screen look "normal"?
If so, then the "back-light" on your LCD has failed.
It's about $20 to replace the part, and about $60 for the technician's time to replace the part.