I have connected it to my laptop, PC, several different other power supplies to eliminate that as a cause. I have a travel charger and one i keep at home. both have the same results. have tried holding the power button then placing into the cradle, still not working and blinking red light. i have had 3 watches sent in for repair / replacement in the year since i first purchased this watch. now it is out of warranty. this is by far the most problimatic smart watch i have ever owned. very dissappointed.