Leave it without a battery for about 2 or 3 minutes. Remove sim card and sd also. Reinstall battery and sim card and see if it boots. Also check that the power button moves when pressed. Plug it on the computer and see if it works. If that doesn't work, you might very well had a major haardware failure. Try a different charger and cable to rule them out. You might think it works or that the batteries are charged when they may not be charged due to a faulty charger or cable.
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