I dug up my fourth generation iPod (iOS 5.1.1 jailbroken with Absinthe) today and charged it. However, the moment it is plugged in, it turns on, instead of charging. It boots to the apple logo, but it either restarts at the apple or at the spinning wheel, not allowing it to properly boot. I believe that it doesn't have enough energy to get over the booting "hump" and cannot charge without bootlooping. Is there any way to somehow stop it from continuously booting?