Funky .plist files can cause all sorts of goblins. Of course you have already set "Computer sleep=Never", "Display Sleep=Never", unchecked "Put the hard disk to sleep when possible", "Slightly dim the display when using this power source". (battery) and unchecked "Automatically reduce brightness before display sleep".
Delete:
* com.apple.systempreferences.plist
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== Toss system pref's ==
Funky .plist files can cause all sorts of goblins. Of course you have already set "Computer sleep=Never", "Display Sleep=Never", unchecked "Put the hard disk to sleep when possible", "Slightly dim the display when using this power source". (battery) and unchecked "Automatically reduce brightness before display sleep".
Delete:
* com.apple.systempreferences.plist
'''If this answer is acceptable please return and mark it.
'''
Good Luck,
N.