Monitor or PC? black lines then black screen, very odd.

This one is weird,

screen just went black after some really strange black, thin, fuzzy, horizontal lines appear on screen, they seemed to cluster on the edge of a window and gradually get worse for 30 seconds or so before the screen goes black.

The monitor itself has power and so does the PC, in fact the PC seemed to be running fine also.

I removed the GPU then rebooted with the onboard graphics and the same happened. This even happens in the BIOS

So I used another monitor and booted with dual display and the second monitor displayed fine through the VGA port but the original monitor through the DVI kept crapping out after around 30 sec with the fuzzy lines into a black screen.

So I tried a DVI to VGA converter to test the DVI port with the VGA monitor and that worked just fine also on both my card on the onboard graphics.

Seems like I have narrowed it down to the monitor being faulty, I mean, I even took a screen shot of the Fuzz then pasted it and the image did not have the lines in it.

But here's what I don't get, why is the faulty monitors menu and settings still being displayed just fine without any lines?

What am I missing here? surely if the monitor is broke then all of it's display should have the these lines right?