May I ask what was wrong with it?

I am experiencing the same issue. I took it back to apple and they replaced it.

Mine just did the same thing. One minute it is fine. The next it is dead. Off to the Apple store I go.

Google "how to fix a dead ipad". There is a discussion on apple's site on how to fix dead ipads (various solutions dealing with power off, charging, etc.).

I took mine to the Apple store and they replaced it. I had apple care. Lucky me.

Another update:

My son left my iPad sitting on top of his PS3 and now the display screen is messed up from the heat of the game. Well it's now his iPad ( he just works around the display issue) and I got a new one. I thought it was time anyway.