My iPhone 4s just turned off and won't turn back on?

It is an iPhone 4s

I have tried the hold Sleep/Wake button and Home button while connected to a computer. It had 70% odd battery life left so it shouldn't have died.

Any answers?

Try entering DFU mode, Google how to do that.
If just that works, good.
If not, try restoring.

Charge it because sometimes batteries can mess with you

Plug it in and leave it plugged in a while to see if its starts charging, probably just ran down is my guess.

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