HTC One M9 wont turn on having replaced the battery

I have just replaced the battery in this phone for a customer, and now it wont turn on. I can plug it in and there will be a charge symbol with a percentage and a small LED at the top like there should be. But if i press the power button nothing happens. I have tried pressing the volume and power buttons combined for 30 seconds but still nothing. Starting to panic a bit

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