I have the same problem on my unit... when I turn it on, it displays "checking disk", then "please insert the appropriate disk" (in 3 different languages). Like 9enisp, I can press the source button and fumble through stations, but the only thing displayed on my screen is the "please insert the appropriate disk". I tried "reflashing" the unit, but no luck. I am about at my last resort to send it in for repair.