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If you can see faint dim images on the screen, then your back light or power inverter has failed. They are not adjustable or repairable and must be replaced. If you can't see anything on the screen, the LCD has failed and must be replaced. Sometimes it's hard to see the dim images so use a flashlight to help determine if there is any image on the lcd.
If your laptop appears to boot up and the hard disk LED flashes, then the problem is probably a back light fault. This can be a faulty inverter or a faulty CCFL lamp. Please click on this link and follow my instructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
i have the same tablet/net-book and also accidentally lowered the brightness past 4/10 of full brightness setting. I couldn't see anything on screen. I found that if i put a bright flashlight to/on the screen, I could see what was on screen, it was dim, but not off. I used this technique to maneuver my way to the settings, display, brightness, and turn up the brightness to where I could see it. I hope this info didn't come too late. WebRepOverall ratingThis site has no rating(not enough votes)
Since the screen is dim, the display's inverter board needs to be replaced.
If you were experiencing discoloration in the screen (pinkish lower light hues) before it failed, that would indicate a CCFL backlight issue. If the screen suddenly went dim on you rather than a slow degradation, the inverter would be indicated.
I think you should look at the sleep button on pin.When you close LCD it should push that pin down(Stanby or sleep pin).
When you press or it get stuck, this pin will block or not send voltage to inverter so that the light on monitor should go off or computer go to standy or sleep mode.Check this one.
best of luck,takecare