Ok, so I was just using my PB and all of a sudden the screen went black and it went into sleep mode. I tried to get it to wake with no success. I then tried to turn it off, again with no success. So I took the battery out, replaced and rebooted. Everything is ok now, but it freaked me out so much. Does anyone know why this may have happened? I don't know if this is of any consequence, but at the time it died a had a few apps open and was using IE (gross I know, but I have to use it for an online uni app). Is there some way I can check if there's anything wrong? Thanks for any advice!