'''++Daniel Delgado++''' double check your power adapter and make sure that it is working properly. Try another cables as well. If those two things are okay you will have to focus on the power connector. Make sure it is free of any dust/debris. Use a few drops of isopropyl alcohol and puffs of compressed air to clean it. If the power accepts your charge cable ok then it is time to crack open your Fire HD. You can now measure on the connector if it does indeed get power. If so you will have to check the battery voltage next. Measure without having the power adapter plugged in and then when it is plugged in. Let us know what those voltage are.