Screen brightness fluctuates despite adaptive setting being disabled

Hey everybody.
I'm on a 2012 13" MacBook Pro running Windows 8. I've been noticing my screen brightness changing randomly in the middle of all sorts of tasks. It's always a very sudden jump to a brighter setting--never dimmer. Everything's turned up all the way and I've followed the internet's instructions to disable all the adaptive settings that change the brightness. Still happening, so I'm suddenly concerned it might be a hardware issue. Any insights?
Thanks!

That's good news.
The new account is using information from a brand new Preferences file which is unaffected by whatever made yours misbehave.
Do this: Go to the Finder and select Go to folder like so:
then type library like so:
oops, posting too fast... stand by while I edit this...
As I was saying...
Click Go, then find the folder called Preferences and open it. Then find the files called
com.apple.universalaccess.plist, and
com.apple.systemsound.plist
and drag them both to the Trash.
Log out.
Log in again and open System Preferences > Universal Access. Configure all four tabs the way you want, then close System Preferences.
Does that fix things?
Message was edited by: John Galt

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Screen brightness fluctuates despite adaptive setting being disabled

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