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If the adjustments you need are blocked out either it is that something that is connected to the set for signal (cable box, sat box, receiver etc) is now in control or in some fashion you have locked out the option yourself--I would have a good look at the owner manual first and if that fails call sharp with the model number----if you recently hooked something new up to the set or moved set from one location to another it may have happened then.
I may have a work around for you. I also have this model and the same problem. after trying many many sequences of turning on and off with setting changes I came across something that works for me 100% of the time. Turn off the tv. Place your left and right hand on the top corners of the tv. flex gently back and forth. turn tv on. this works for me. I can only say that this tv has some quality control issue(s). it will be my last Sharp product. this was a lowest bidder produced by a company other than Sharp with a Sharp label on it. good luck.
In the bottom left hand corner there is a Key that says Fn hold that down, then press the key in the top right hand corner that has says NUM LOCK it will be printed with a TOP set of words and a bottom set. Typically two different colors. The Num Lock light should go out