Have you tried to pull out the battery and switch it ON again?

a quick question, do you apply one click lag fix?

if you do that maybe the case here, it happen to me once, my phone hang, and i just pull the battery, when i on again, it stuck and vibrate

then one of the forumer here say, it cause of the one click lag fix, it have corrup your system file or something like that, the only way is to reflash i guess,

Did you managed to charget he battery? Try not to over-drain the battery, once the battery voltage level reaches a certain low level, it will go into sleep mode and a trigger in the circuit of the battery needs to be done. you might still be able to claim warranty if you still have the problem, just remember never to over-drain the battery it causes a lot of stress on it which reduces its life cycle, next time if your battery is low charge it right away but if you do not have access to a charger turn the phone off.

The new KIES broke the perfectness in my system. Now, if I press firmware upgrade button, it says no new firmware like usual. When I close it, that firmware update windows hangs and require force closing.

I think I'd return back to old version or uninstall it entirely. KIES is pretty useless in my needs.