I got the n800 at the beginning of january. I took it to work and my colleague, who has one, helped me flash it to OS2008. we used a PC. we plugged it in the to the USB, ran the flasher, turned it off and it would not turn back on. confused, we moved onto something else and i put it on the charger. I noticed after about 30 mins that it started up again. so we put it on the flasher and flashed it to OS2008. i turned it off and it would not turn back on. i then discovered, like you, that if it is connected to the charger after about 10-30 mins will re-active and then it can be turned on. but if i turn it off, it wont turn or power on until its put back on the charger.

today i decided to down-grade to OS2007 to see if that would work. I used the 770Flasher app for Mac OSX. I did this just now at work and i dont have the power adaptor here so I knew it was a risk. It was powered on, connected to the USB and i ran the flasher.

The flasher reported some shared library errors and i couldnt make out if these were with respect to the flasher app or the n800. after the errors i was able to select the firmware OS2007 file. when i hit OK, the flasher told me to disconnect the n800 and power down. I did this, and reconnected it to the computer. nothing happened. then i thought, maybe it needs to be powered back on. so thinking it wouldnt power on, I powered it on, and it turned on!

the flasher ran, showed some info about the existing system and then reported an error. i wish i had written all this down or taken screenshots but alas, i didnt. so i disconnected the n800. quit the flasher and decided to turn it off and try turning it back on...

... IT WORKED!

and now, in the last hour i have turned it off and back on successfully about 5 times. I'll try it again....

... of course ... this time it didnt turn on.

but wait... lets try the process again...

... now it turns on and off again ok.

i was able to capture the output of the flasher:

Nokia 770 Flasher for Mac OS X
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(c) Andrew Flegg 2005.
http://www.bleb.org/software/770/ Released under the Artistic Licence.

dyld: shared cached file is corrupt: /var/db/dyld/dyld_shared_cache_ppc
dyld: shared cached file is corrupt: /var/db/dyld/dyld_shared_cache_ppc
dyld: shared cached file is corrupt: /var/db/dyld/dyld_shared_cache_ppc
dyld: shared cached file is corrupt: /var/db/dyld/dyld_shared_cache_ppc
flasher v0.8.1 (Jun 8 2006)

Suitable USB device not found, waiting
Error opening USB device: Unknown error: -1
SW version in image: RX-34_2007SE_4.2007.38-2_PR_MR0
Image 'kernel', size 1317632 bytes
Version 2.6.18-200738osso1
Image 'initfs', size 1704576 bytes
Version 0.94-17
Image 'rootfs', size 87162880 bytes
Version RX-34_2007SE_4.2007.38-2_PR_MR0
Image '2nd', size 8064 bytes
Valid for RX-34: 1301, 1302, 1501, 1502, 1503, 1504, 1601, 1602
Version 1.1.6-5
Image 'xloader', size 9088 bytes
Valid for RX-34: 1301, 1302, 1501, 1502, 1503, 1504, 1601, 1602
Version 1.1.6-5
Image 'secondary', size 95872 bytes
Valid for RX-34: 1301, 1302, 1501, 1502, 1503, 1504, 1601, 1602
Version 1.1.6-5
USB device found found at bus 005, device address 005-0421-0105-02-00
dyld: shared cached file is corrupt: /var/db/dyld/dyld_shared_cache_ppc

------------

this seems to be a problem with the flasher. anyway, now at least i can turn it on and off and it will mostly always work. much better than before.

i dont know if this "fixed" the problem or if it was circumstantial. perhaps there is something odd about the USB port - like maybe it gets put into a "mode" or something that prevents the n800 from switching on?

i find it hard to believe its a hardware problem. any word from nokia on this?

brett