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Hello, I am here to assist with your Sony TV issue,
Many issues can be resolved by performing a hard reset of your tv, this will set the unit back to factory defaults.
Here is the Sony tutorial: http://esupport.sony.com/US/perl/tutorial-display.pl?tut_id=300&mdl=KE42M1&session_id=b28ca60ddec9afff90dc67ee3745a34a
I hope you find this information useful if so please accept my answer.