My HTC 1 won't charge and won't turn on.

[AC Question]

My HTC 1 won't charge and won't turn on. When I plug it in it just flashes an orange LED and shows a picture of a rectangle with a lightning bolt inside it. I have tried pressing the power button, the volume up button and the volume down button but they won't do anything. It just turns the phone off or shows a picture of a rectangle with a plug inside it. Help please