I had a similar problem with my new Nokia N810 which came today. It all worked OK except when I slid the keyboard out. Then it went into a reboot loop. I updated to the latest firmware using the Internet Software wizard on my PC and the problem seems to have gone away. Thankfully I searched the newsgroups before thinking of returning the N810. BTW, the internet experience is mega better than my old pocket PC. I can even play the footy clips on the Beeb