I had the same problem. I was looking at my child and accidentally hit the hibernation mode. I thought I really done a number on it. After seeing some of the post on here I just knew I would never get it started back up. I read several hints on here and put a couple together. I'd just like to say thank you for the post being here for me to read (AND UNLIKE SOME SITES I DID NOT HAVE TO HAVE MY VISA ON HAND) I would like to share experience so maybe I can help someone like the people on this site helped me! Again thank you!
I took the battery out, unplugged the ac adapter and also unplugged the adapter from the wall, pressed down the power button and counted to fifteen, left the battery out, after ten minutes I plugged the ac adapter back into the wall and computer (leaving the battery out), as soon as I hit the power it came back on! It did shut down and restart. After the computer completely rebooted I put the battery back in and unplugged ac adapter from the computer. No problems since!
Thank you to everyone on this site. This site and all of you R totally are awesome!!!!