HELP!Cannot save MONITOR/System settings

Hi, I am a newbie-using a CUBE,

and I think I crashed something:whenever I start the system preferences/adjustments,I cannot save the Monitor settings/Display options,such as reducing Quartz to fit TFT(general adjustments).
In the Monitor calibration menu,the calibrated new settings cannot be setted afterwards after new start of Sytemadjustments.
I tunes asks EVERY time for the license agreement and then searches for something llike caap or so before opening up the playlist.
Since I trashed every file I can think of where these programs put in their userpreferences and the problems still exist-I tend to conclude,that there must be some invisible files/floders in the user preferences which I still cannot find.
Also what is the cache in the user Library,since there seem to be also some files of monitor prefs?
last thing:When I lock in under another user-the problems are gone-but being locked back under my first esablished user name I cannot clear the other User names.
Please HELP.
Thank you
 
"When I lock in under another user-the problems are gone-but being locked back under my first esablished user name I cannot clear the other User names"

Check that the user account you have created is allowed to administer the machine. If it isn't then that explains why it can't be used to change monitor settings and so on.

If you're still stuck, I'd suggest running /Applications/Utilities/Disk Utility. Select the "Repair permissions" option.
 
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