So, I have an HTC one through Verizon wireless and recently the screen just turned black out of the blue... Pressing the power button doesn't bring up the lock screen like it should. When I hold down the power button, the home button flashes but the phone doesn't shut off. This phone is only a few weeks old and I haven't rooted it or downloaded apps from unknown sources or anything. Please advise! UPDATE: I was able to shut the phone off by holding the power button down for what seemed like forever... Then it turned back on when I hit the power button. But now the phone is lagging when I type anything... Like it takes a few seconds then immediately fills in the last 4-5 letters I typed. This phone is brand new and I'm a little worried that it's already having problems... Does anyone know why I got this black screen, or what I might do to diagnose or resolve the issue?