Okay my sister was using my computer on battery power and the battery ran down and before I could get it plugged it went into stand by mode but now, even though the battery says it's fully charged the screen s really dark. Very, very dark. I can make out certain things. Enough that I was able to get into the settings and try to fix the brightness levels, you know on the balances, power saver and high performance but the screen remains very dark.
Solution? - not sure yet but having read solution by Hector_ahab, tried various F() buttons in conjunction with Fn button. Pressing Fn with F6 switches between black and normal screen on my Acer Aspire 5920. Fingers crossed!
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I have a very similar problem. On rebooting the computer though, screen returns to normal, although very occasionally and for no apparent reason, goes black again, requiring another reboot. On contacting Acer for repair under warranty, they say it should be returned but warn a fee of almost £70 will be charged if it turns out to be software related. Any help appreciated.
Look at your function buttons like F11 or F12 (somewhere up there) and see if you find anything that doubles up on those keys to adjust the brightness or darkness of the screen by pressing the FN (fuction) key.
Have you tried checking the BIOS power setting's? should have something for dimming when running on battery.
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