Is the battery dead? Try rebooting the phone while it is still plugged into the charger. Try a spare battery. If you do not have a spare battery you may be able to find a friend with a GS3 to try their battery or stop by a Verizon store and ask them to test it for you. If the battery is not the problem and repeated battery pulls do nothing, then it's probably a hardware problem. Does the phone actually reboot and the only problem is the blank/red screen? If so can you boot into Safe Mode?