Answer to "iPod won't power on after screen replacement, even when plugged in"Just to help you all out, I confirmed that a latest update fixes compatibility on new replacement screens. I was having issues as well with black screen lightly flickering but not powering up, however the oem cracked screen I took off was working. I had 3 screens tested on another ipod touch with ios 6 and all worked, but not with the one that was on ios 5. I updated ipod touch with the cracked oem screen on iTunes to ios 6.1.6 and tested the screens and all worked fine now. The black flickering I can confirm is a ios compatibility with replacement screens.