Before the thread police attack, yes, I have searched for this issue. It appears others have had similar problems with the N770 and N800 and no effective solution has been proposed.

I have an N810. It's about a year old. Every once in a blue moon this would happen and the solution was remove the battery, put it back in, and go.

I was using my N810 when it froze up. Even pressing the power button didn't get it to respond so I removed the battery for a few minutes, put it back in, and powered it on. I get the "Nokia" splash screen and the blue progress bar. It goes all the way to the right, sits for about a minute (maybe less) and reboots. I have let it sit here on my desk for about 20 minutes and it just continually reboots.

The battery was fully charged. I could reflash it, but I haven't done a backup in a couple of weeks and would like to get it going without a reflash if at all possible.

Thanks,
John