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Could it be an hardware problem? a white horizontal line just over the programm signs. it is there after the last update of os x 10.8.2 (12c54). is there a possibility to test the monitor?
Thanks
iMac, OS X Mountain Lion (10.8.2), Late 2009
same problem
same problem
Display dammage... 650.-€ for a 3 and a half yearsold imac.... not good!
there is a horizontal line on my monitor just over the program signs
