My new 7500 just arrived, but I seem to have a problem. I can't get to the setup (or any place else) because there is no response to the touch screen. I'm guessing that the problem is the touchscreen hasn't been calibrated, but how do I calibrate it if I can't get to the setup menu? After waiting weeks for it to arrive, I sure hope it isn't broken. I did a quick scan of the manual, but didn't see anything that would help. Needless to say I'm anxious to get it going and may have missed something. Help please.