Help, My Nokia Lumia 920 is stuck on the spinning gears with 1/8 progress, i cant get it out of it, should i just wait it out? its ran out of battery already once and resumes where it was, i updates to 8.1 just fine, but when trying to get cortana working it got stuck here, when i restart using volume down and power it goes back to the gears and resumes! help and advice would be much appreciated. Thank you