Stuck in reboot cycle

I have installed the Tech Preview Enterprise version and all went well, till the system got stuck in an endless reboot cycle, it reboots; gets to the windows logo, shows the progress wheel for about 30 seconds; then a black screen with the evaluation number
in the bottom right corner and then just stops and reboots. It has been doing this for several hours now, any ideas of how to break this cycle or do I need to wipe it and go back to the old OS

Hi
Can you boot into safe mode and then check the logs for errors why its not booting?
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i have the same issue:
Hi, got my lumia 920 a week ago at the most. First day, wouldnt turn on after initial setup. Hard reset, this went on for a couple of days, thought an update might fix it, got around to it and now the phone is stuck in a reboot cycle, goes from Nokia to black screen back to Nokia and so forth. I tried the power/volume down key, no luck, before that, the phone wouldnt even open up settings, brought up a "loading..." message and back to homescreen. Help
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Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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You description ssounds not very good ;(
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In this case, I think that there's something damaged that can't be fixed just reinstalling OS X.
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