Thanks Jeff ..
But I have found that's something wrong on me or wrong on the N800. When just turn it off, and want to turn it on again, it is fine, as you say, just one second or two maximum. But the problem is when I turn it off, wait for more than 15 minutes or more (the time you want) ant try to turn it on, I keep the power button pressed and nothing...try one, two, three times more and then it turn on. Seems like something get cold and cause the failure, or ..I don´t know...