Analog TV will only Display the X-axis?

I have an old analog Panasonic, and use it for my Wii (i think it looks better than using it on an HDTV)

Today, I switch it on and only a huge line in the middle of the screen about 2 pixels tall, it looks like this:

This Tv has always worked perfectley, and I've tried:

Turning it on and off countlessly.

Hitting the Menu button.

Anything.

What can I do, or has my tv just met it's end?

Your tv is msot likely at its end. It happened to my friend's old CRT tv and it wasn't worth it to repair the tv. This happened to my cousin's tv as well, but it would sometimes work properly if you left it on after awhile. It's not worth the hassle if this method does work for you though.