Yeah, I've tried both resolutions that the display settings were offering.
I tried this on an external monitor, the snowy blocks showed up there too, whatever resolution or mode (mirrored, extended, etc) I tried. It had the 2nd monitor at a nice high resolution too, but with the pixelated snow all over.
I tried starting in safe mode (where the screen looks great, no snow, but at the lower resolution) opened Device Manager and found that it appeared to have two of the Intel chipset graphics drivers installed. I cleared out one, restarted, it went into normal Windows (not safe mode) at the low resolution with the screen working fine.
I then re-installed the drivers (I let it search for them), and it came back up in higher resolution with the snowy effect back at the login screen.
Based on all this I'm pretty convinced it's drivers or other software, I'm pretty sure it's not the LCD or cable.
I'll see if I can find some other graphics drivers to try