Toshiba 43AX60: sound but no picture

try switching to a different video source and play a DVD or a game system. If the issue is still there try unplugging the TV for 5 min. and then plug it back in.If the problem works fine on all other devices except the video source that has the issue try hooking up the same device your having the issue with to a video source you know works if that works then you have a bad video source on the back of the TV, if it does not work it's either the cable going to the TV or the device itself.