Press and hold the red hang-up button for 5-10 seconds
Make sure the battery is inserted correctly
Charge the phone overnight
Try a different charging method. If you typically charge the phone with the dock, try with the cable directly and vice versa.
If you have another micro USB cable, try that one.
Use a different outlet.
If the problem persists after following the troubleshooting solutions and you believe your phone is defective, please fill out the replacement request form.