Great question. We've got a few of the possibilities listed on the device's troubleshooting page, but I'll go over a couple here. Make sure that your device's power button is pressing correctly. If it seems sticky or doesn't move, you may need to open up the device and re-seat it. If that's not the issue, make sure that lights are turning on when you attempt to turn on the device. If they are turning on but your screen isn't, your device's motherboard or LCD may be going bad. If no lights turn on, likely your battery has gone bad or won't hold a charge.