iphone 6 plus will not charge or come on
I let my battery run all the way to zero and my phone turned off. I connected it to the USB cable that came with the phone to my computer to charge it as I have done everyday for the last 3 days without issue. This time it shows the low battery/charging symbol then the apple logo then nothing and starts the cycle over. I tried plugging it into the wall charger instead and the same thing happens. I tried rebooting but that isn't working either. It's been 12 hours with no change and no charge. What do I do?
iPhone 6 Plus, iOS 8.3