I FOUND THE FIX,
I have this same problem after updating iOS 8 . I contacted local authorised service centre and Apple online care as well. Service engineers said there should be a hardware issue thats what it not charing and its keep rebooting, also they said its out of warranty and you have to replace the whole device by new one for that you needs to pay the whole money as new.
Even Apple oneline care told me, since there is no battery backup they cant resolve it by online. they asked me to go to service centre. But service centre peoples are trying to sell a new IPAD to me.
I searched in internet and found nothing ,except how to go to DFU mode and recovery mode. i tried about an week by restoring both methods and still nothing has changed,
But i noticed one thing, since we can see the Apple Logo everytime its restarting i was thinking sure there could be issue with charging of the IPAD Battery . i changed the apple charger and i changed USB cables, nothing worked.
Finally i decided , i should charge the IPAD at anyhow, for that at least IPAD should be OFF condition about 1hr . I searched to stop rebooting loop, but i failed from all internet options.
The FIX :
WE have to connect the IPAD to Macbook, and open the ITUNE (latest version ,if u dont know then reinstall the Itune again)
then I bring the IPAD to DFU mode, by pressing home and Sleep button together for 10 seconds and release the sleep button and after 15 seconds .
Now i got the Restore screen , (DONT CLICK THE RESTORE OR ANY OPTIONS) and i left the screen with my IPAD connected for 2hrs. dont do anything just leave the macbook for 2hrs.
YES, my ipad got charged about 7% , then i switched to wall charger and its working fine now.
If peoples dont have the latest iOS, on the restore page go ahead on restore option it will update you the new iOS. But once its fully updated then again you have to go to DFC mode and left your IPAD for few hrs without click on the restore button .
Hope this will help you guys,
let me know if you need any doubt,
bbabhu@me.com