The lines in the back ground are typical when G2 is turned up.
The vertical and horizontal section seem to be working.
The video amplifiers look like they are working.
It goes in power down mode when you give it a signal (antenna or A/V input). It works with a menu. Are there other inputs that work?
Who do you get to "Default blue screen"?
It acts like it is not switching from one input to another. If it does not find a sync signal (video) it just powers down.