So lets try this and see if it helps.
Hard Reset using buttons:
Press and hold the Camera + Volume Down + Power until the phone vibrates. Then release the Power key and keep pressing the Camera + Volume Down for a few seconds.
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My Nokia Lumia 920 shows the lightning bolt and gear icon. does not start and is frozen on that icon.
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So lets try this and see if it helps.
Hard Reset using buttons:
Press and hold the Camera + Volume Down + Power until the phone vibrates. Then release the Power key and keep pressing the Camera + Volume Down for a few seconds.
A HAD SAME PROBLEM TOOK OUT MEMORY CARD ATTACHED TO LAPTOP AND PRESSED VOLUME <DOWN> AND POWER BUTTON AND IT CAME ON
freezing lumia
problem solved
Camera button!
I do the reset and right after the vibrate I release the power button (but remain holding the camera + volume down) and I get the AT&T screen. Then it says Nokia, but it goes back to the cogs or it goes to a low battery symbol. I don't get the Windows Phone screen. Any ideas? It's been non-functional for 10 hours now and is getting frustrating. I have a long car trip tomorrow and not having a phone would be difficult.