I upgraded my Google Play Edition Samsung Galaxy S4 to Lollipop 5.0. The first time, after finishing with all the upgrade, the screen went all black except for the top line, where the battery, celular, wifi and notification icons appear, so I could not use the phone. After hard reset, phone was with normal screen, using it for a day. Trying to setup VPN, it required a password. I setup a pattern password and immediately after confirming it, the screen went all black again. Nothing I did would let me see the screen content again. Hard reset #2. Help!!