I've been in the middle of moving apartments. In the shuffle, I've not used my n800 for maybe 3 weeks.

I'm guessing the battery is run down to zero and might be creating this problem. But I'm not sure.

I try to charge and it shows the charging icon, but the battery doesn't actually take it.

If I have the AC adapter plugged in, and turn on the n800 it doesn't run off the adapter as it usually does, it turns on but continues to drain the battery. Finally it was completely drained and the unit no longer even turns on. If I plug the ac adapter it will still show the charging icon but not charge.

The n800 hadn't suffered any major impacts or anything. The only issue was that it was turned off for a few weeks. Any ideas?

The N800 does not run directly off the charger (or so this forum has me believe). It runs off the battery and power is "passed through." Therefore you must have a battery with enough charge to boot the tablet into it's "firmware" (before the desktop) in order for it to do anything.

Nokia suggests that you fully charge your battery prior to starting it up for the first time so my suggestion would be to plug it up for a few hours and then try to boot it up.

Also there are cases where batteries that have run down their charge and don't receive one in a while can just go flat. So you may be looking at a replacement battery.

Thanks for the reply sondjata, this is sort of what I thought the case might be. So yeah, the battery is probably just dead at this point.

I left the n800 turned off to charge it but the battery just isn't taking it.

I would try a different plug-in point, just to be sure. And I'd buy a cheapo Hong Kong battery to replace it, and a charger while I was at it. You can get a charger for about $10 and less for cheapo batteries.

Leave your current set up plugged in for 8 hours before even trying it again with your current battery.

Since geneven mentioned it. I have found that some dedicated chargers can kick start a battery from the dead. I did that with a Creative player I had sitting around. I plugged up a RadioShack charger and it had enough juice to kick the battery to life so a separate charger may do the trick.