Casio CZ/ VZ/ FZ - Pro Series

I just picked a casio vz-10m at a pawn shop for $75.

It worked great but I noticed the presets had been changed, so I reset it. Held write during power up.

It seemed to reset it, but now the LCD is blank (all pixels darkened I think would be the best description.). 

When I turn it off and on, I think it shows an error message or at least some sort of text before the display goes all dark, so I'm pretty sure the actual LCD is still fine.

It still seems to be working and I can play all the original presets now. Just no LCD.

Any ideas on how to fix it? I'm hoping it is simple. Right now, I have it unplugged and will try it again in a few hours.