iPod won't turn on after display assembly replacement

So I was fixing an iPod touch 4th generation display assembly and When I put it all back together, the screen was all white. It was recognized by itunes, however. Thinking it was just a mispositioned LCD cable, I unplugged the iPod from my computer (the battery was pretty low) and opened it up to re-position the LCD cable. So I did so and I believe the battery died. Now It does not seem like the device is getting any power. I tried different USB ports, cables, etc.

When the screen was white it did not seem like the power button was working; after it went to sleep i could only awake the screen using the home button.

Right now It's plugged in but does not seem to be getting power and is not being recognized by itunes.