Try the following:
- Holding the power button for 10 or more seconRAB.
- Holding the power button + volume button for different perioRAB of time
- Holding all buttons for different perioRAB of time
- Connecting it to different chargers
- Connecting it to the computer
- Starting Zune
- Warming the hanRABet up carefully, in your hanRAB or with careful use of a heat source and try again
- Connect phone to PC. On the start menu access the Devices and Printers under control panel, right click the device and press troubleshoot. Let it complete the process and even though it says could not solve, phone might vibrate and turn itself back on.
If all of the above or any corabination of them fail, take it to a Nokia Care point.