Not working after screen replacement

I had a cracked screen on my 4th generation nano. It was working fine, only the screen was bleeding after I dropped it and that kinda annoyed me. I have replaced the screen exactly like in the instructions.

I had a bit of trouble initially prying it out, but I didn't snag the hold wire. I'M pretty sure of it because I was extra careful and it looks fine.

However when installing the new screen it doesn't work. the screen stays black. if I switch over the hold switch I get sounds from the click wheel but there is no music either.

Is there anything I did wrong? Did I break anything? I don't think the new screen is dodgy....

Any help would be appreciated! I'm at a loss as to what it could be!

Thanks!