Mine is doing it, too. A year to the month since I got it. No warranty.
That really sucks because I liked the n800. But now that I see that this is a common problem with this device I will NOT be replacing it just to have it fail again. I can't afford to buy anything right now so I guess I'll be getting my pocketpc out of the drawer and charging it up again. The browser on it sucks. The speaker on it sucks. But at least it can do PIM, internet radio, ebooks, and audible stuff which is what I do most anyway. Not to mention accessing my orb stuff. Say what you want about my old pocketpc, but at least it's still working! I even have an old Ipaq 3630 that STILL WORKS.

BTW, at least I can still use the n800 on the nightstand as an internet radio. I just leave canola running all the time. Set the display to black out right away. Because it seems the screen is ok for a few seconds when you first wake up the screen. At least long enough to select my station.

Other than that. It's now useless. What a shame!