The screen has become very dark

first time poster looking for some help. today the computer went to sleep, and when i woke it up the screen had become very dark, barely visible. adjusting the brightness did not work, neither did restarting the computer. after reading a number of these posts i elected to reset the pmu. i suspect that it worked because a window opened stating that the date was now prior to sometime in 2001, but the screen remains dark. does anyone have any other suggestions to fix this problem? thank you in advance.

Try System Preferences>Universal Access and then choose Seeing. Adjust the Enhance Contrast Slider, try putting it near Normal.
Hope this helps.

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