can you try doing this and look if this works? get your tv's remote control and try looking for a "source button" that way your monitor knows where's the source of the image it's suppose to display? it's like having options like (analog, video, cable, PC) like those things, it's what i do with our lcd, but i don't use hdmi cable, just the normal cable, it's not panasonic actually, it's samsung, when i connect my desktop there to play games (it's fun to play with the lcd for it's so huge lol) i just turn on the PC and click the source button on the remote and then it's there, i just reconfigure the resolution, and i can also check if any good shows are on HBO clicking the source and changing in to cable and back to PC again, well there you go just look for your "SOURCE" button hope i helped