This happened to me as well after replacing the display assembly on an iPhone 5S. Phone would start with the standard Apple logo and then screen would go blue and then reboot repeatedly. Would not stop nor would iTune recognize the phone. What it turned out to be was the home button cable was not seated correctly. Reseated the connection and it worked perfectly. Good luck
Some other issues which I dont believe were discussed. Key to having the glass sit flush after screen replacement ( only tips that were not previously mentioned) (1) Make certain there are no small fragments of glass underneath the metal midframe as well no screws are floating around the body of the iPod (2) Bend out corners and pry them as best as you can outward if there are dents (3) Clean the area around the edges of old adhesive, glass and debris (4) Heat with a blow dryer or heat gun a bit prior to adding weight to cure the adhesive. Not absolutely necessary as suggested but it never hurts either. Good luck
This is way late but for others using ifixit.com you need to remove the back of your iphone and remove the emi shield covering the speaker and check to make sure there is nothing in that area which is causing your inability to hear callers. If your able and willing you could replace the earpiece speaker without absorbing a huge cost. Next time stay out of the Barley ( think you meant barely) All the best
Had some issues with an iPhone which were similar to this case. Replaced one screen for a customer of mine after she broke it. She brought it back cause it was black.. I assumed I just had a bad batch of screens. Checked seating of battery and reseated and checked connections to LCD. I have now burned out two screens because of heat. Never thought to check heat. Just happened to be charging it for her and noticed it was very hot. Gets hot at the upper most part of the logic board on left side very near the camera. Replacing the logic board was the remember but now I have a board that seems to want to continually overheat to the point where battery charge declines rapidly. Moral of the story is to check heats. What caused it? Probably something I did ..
Just to add more information to this thread. When you are done replacing the screen I always find it best to reheat the ipod again so that you get it to sit properly .. After heating it place some objects on top like a book or two so that it can cure overnight. Careful not to use too much weight..