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The set needs a new LCD if it looks cracked and swirly, the colors all run together in the area of the crack don't they! If it is cracked it can't be fixed. you can replace the lcd but I am not sure if a warranty will cover a cracked screen or not. You will need to contact LG and be very nice to them and see if they will honer the warranty on this.
1- check all the cables that are hooked up to the TV
2- try to get audio to and external speakers or home theater (to check the sound card).
3- if the step # 2 don't work either you have a bad sound board on your TV.
4- opn the TV try t get the part # of the board, and replace it
Is it this way no matter what input you are on? Try switching to each input and then going into the menu to see if it is still greyed out each time? If it stays greyed out, then you have a bad main board.