Hat geantwortet auf: Power Button Not working after screen replacementI had the same problem - my power and volume buttons stopped working after replacing the battery. Refer to step 8 here, specifically the 2nd screenshot (2 of 3). I had to reseat my power/volume flex - I did not have to reseat the connector to the board. The 2nd screenshot shows a cable that could have come loose. Mine was glued down and taped, but had still come loose (probably while heating the phone up to take the back plate off). I used long thin pliers to peal the clear tape, reseat the flex, and put the tape back on again. The phone works great now!