IOS – How to change power savings settings on iPad 2, iOS 4.3.3

At iPad: Understanding screen rotation lock, Apple says:

Beginning with iOS 4.2, the switch previously used for screen rotation lock functions as a silence switch for notifications and system sounds.

Sucks, doesn't it?

It is still possible to lock the screen rotation on an iPad (and that article explains how); there's just no hardware solution any more.

All iOS devices do that after they have been completely discharged.

If it does not boot up with in 5-10 minutes of being plugged in, then it could be an indication of hardware failure. The battery is likely not accepting a charge.