Iphone 5c won't charge or turn on?

I've had it nearly a year and it has worked fine, but it ran out of battery 2 weeks ago, (whilst on aeroplane mode if that means anything) because i was on holiday i didn't bother charging it until i got home yesterday. Its been charging all night, but there's still no charging sign and the screen is blank. I've checked the charger and it works, and i've charged it on different chargers so its not the charger. I tried rebooting it (holding both buttons down for a long time) and nothing happened, i tried it again this morning and still nothing? What could have happened to it and why has it done this?

It could be the charger port if it just sat there without use! It couldve piled up some dust, clean it out with a needle gently, and a small piece of a cotton ball ( a bit damp or moist, make sure its not lots of water) then again with the needle if it doesn't work, its time to get it fixed or a new phone!

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