My iPad is on the 5.0.1 firmware and was jailbroken just to use retinapad.(ie no other tweaks installed). It was working fine but yesterday it ran out of power so i plugged it to the wall charger (12W) but it just won't turn on. First it displays the red battery indicator and then it continues the boot sequence by displaying the Apple logo then the screen turns black and this process continues. Last night i kept it plugged in to the charger for about 10 hours but the same thing happens the above mentioned sequence repeats over and over again. I tried restoring the ipad to various firmwares (7.0, 5.1.1, 5.0.1, even 4.3.5) using iTunes and also redsnow. iTunes gets stuck on the error message 21 and redsnow shows restore failed. Tried entering the reset putting it into DFU mode and restoring but nothing seems to work. I even used tinyumbrella to address this problem but still nothing. I have all the necesasary blobs for 4.3.5, 5.0.1, 5.1.1 But still nothing. It continues that loop and nothing else happens. Don't know what else to try. If there are any suggestions that can help me solve my issue i would be grateful. Thank you.