Just picked up a brand new Sprint ZTE Max XL. Put it on the charger the night we got it (2/20/18) and when we woke up the next morning it wouldn't power on. Nothing but a steadily blinking home button. Tried everything. Hooking it up to computer. Holding the power button while plugging the charger in. Hard reset. Nothing would change the black screen and blinking white light. Decided to try one more thing this morning. Pulled the Sim card (which had been installed by Sprint) and re-seated it. Phone fired up like a champ.