Help my iphone 3g is not working?

My iPhone 3g is not working. I plug into into the wall nothing happens i plug it into my computer on itunes its say the iPhone is plugged in but nothing is coming up on the screen

Added (1). Also the same thing happened before but i don't touch it for 3 months the i did and it started working and an hour ago it was working perfectly

Your phone is old and probably needs a new battery.

Try a hard reset. Turn it completely off for about 5 minutes then turn it back on.

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