Hi, i recently jailbroken my ipad 4.2.1 using redsn0w. However, when I went out today, it ran out of battery, so i charged it when i reached home. It is now stuck with the apple logo, and won't boot up. I know i must use redsn0w to boot it, but i can't off the ipad for it to enter DFU mode. I tried using the home/lock button 10 sec, but it resets the ipad rather than turning it off. Can anyone please help get my ipad back up and running please? Thanks.