920xt Charging Clip Problems

I have a Garmin 920xt and since last week I couldn't charge my watch. Whenever I connect the charging clip with the watch on my Mac laptop, it would show that it's connected to the computer but would disconnect after 3-5 seconds. Same thing happens when I try to plug it back. Whenever I connect it to a charging port to try and charge it directly from a plug, it wouldn't charge at all. What could be the problem? I already tried the tips on cleaning the contact port for the charger on the watch and the clip. I don't get why it would read for a short time on a computer but not charge at all from a direct power source. The watch was dropped last week on the ground waist level while it was connected to the clip and the laptop.