This has happened to me only once a few days ago but I'm wondering if I could be headed to a problem on the iPad2? Latest iOS5 and it is the 64GB WiFi model if that matters. What happened was I had used the iPad earlier in the day. I closed the smart cover as I usually do. The battery had plenty of charge. I re-charge it when it nears 20% or I get the warning. Rarely sync it back to iTunes on the PC and it hadn't been done for maybe a week. I go to use it again and open the cover. Rather than seeing the normal pin number prompt I see a black screen with the Apple logo? Hmmm, close the cover and open again. Same thing... I now try what I believe is reset key combo, the power switch and the home button on front. After a few seconds the screen went black... OK, powered on, same situation, Apple logo but nothing happened? Tried again, same thing? OK, I'll call Apple. So I power up my PC and open iTunes to get my h/w serial number. So I open the iPad again so I'll have it 'broken' when I get a call back. Surprise, the pin prompt was there? Does this portend a problem? Was the reset actually working, just taking a lot of time to come up? Irv S.