I just got my N800 tablet last week (second hand). I've installed a bunch of apps on it, but no changes in the last 1/2 day or so that I remember. But this afternoon my screen starts flashing or blinking every 5 seconds. It's not a biggie to reflash & start over, but (hopefully not) is this an indication of a hardware problem? tx

Same thing happened to my gf's about a week after buying it new. I put an SD card in the internal slot and the blinking stopped.

Same problem back in the day, zounds like your shite is fooked up try re flashing and take note what you install.. Python screwed me up after i re flashed, did it again and it worked perfectly, plus never buy a hand held used your just asking to be screwed.. Bought a 770 used that was all messed up and guy didn't think id travel back for a refund.. he learned the hard way.

I had it sometimes, after a reboot it went always away.
Removed some unused software (also some python stuff) and after that I never saw it again. Due the random occurrence I can't say what exactly provoked it but it looks like some kind of software mixup that's causing the problem.
If you got it recently I would say reflash for a clean start.

I had flashed it as soon as I got it & it's been rebooted several times recently, so it must've been something I did. Just got me worried. I'll start over. Thanks all.

I have had this happen twice in the last month.

As far as I can tell, it happened when I changed the setting that tells the screen to stay on while the unit is charging. I would pick it up the next morning and it would be flashing like you described. I turn it off and on and then everything is fine. I turned off the option to have the screen always on while charging and it did not re-occur, until I changed the setting back to having the screen on while charging again.

Since I've reflashed I haven't had the problem again. I regularly change my screen settings back & forth because I like it to stay on when I'm at my desk but would prefer it to go off overnight. No problems yet (crossed fingers)