My garmin 910xt power button not functioning

i have my garmin 910xt. when i am using the watches suddenly switch off. when i switch on with the power button was not functioning. how to resolve this matter sir. i just bought this watches early february this year. i am looking forward your quick respond.

out of battery? plug it in.

Try reseting the watch. It usually works in 310xt.

i already plug in to the charger but still not functioning
.

how to reset the watches? cause the power button still not functioning. the charger not detected to the watches when i plug in.

Press and hold the power and reset (lap) buttons at the same time for 15 seconds
.

To perform the Master Reset:
Power off Forerunner 910XTPress and hold ModePower on deviceRelease Mode when the* Do you really want to erase all user data?* message appearsSelect Yes
If that doesn’t work you can do a hard reset, but you will lose all data in the watch.

the main points is the power button not functioning. yesterday i used this watches it is working well. suddenly the watches turn off and froze. i keep it away for a while and felt hot on that watches. i thought it running of battery. once i cannot to the charger it was not detected until today i keep trying still not functioning. any suggestion to encounter this matter.