I had the same problem (as well on a jailbroken iPad). It took me a while to enter DFU mode, but it works and you will be fine. Connect your iPad to your computer, hold power and home button, wait until the Apple logo turns off and on again, release power button but hold Home buttoun until the iTunes and USB symbol appears. iTunes now recognizes your iPad again and offers to restore it - after you have done this you will be fine. Good luck!
This is what happened. I went to settings>general and reseted everything. I know this process takes forever so i left it on the table. My nephew tried to turn it back on and now its just stuck on the apple logo. I connected to itunes to restore it but itunes wont even recognize it. Any ideas???? Im freaking out
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A fix worth checking out
Here is a fix for the "iPad stuck on Apple Logo" and or "unable to update or restore."
For thous of you who are looking for even quicker answer the process is very simple.
1) Launch RedSn0w 0.9.6b4 or later
2) Chose an iPad Ipsw
3) Then chose "Just Boot tethered right now"
4) Then follow the DFU instruction
Good luck...
Here is the site...
http://www.techtosh.com/ipad/fix-your-iphone-ipod-ipad-ios-4-2-1-stuck-on-apple-logo-reboot-cycle/
Try this first just to be on the safe side. (however this didn't really help in my case)
http://support.apple.com/kb/HT4097