I took mine apart for this very thing. The other buttons clearly click, but the middle button was kind of mushy. I don’t see a way to easily remove the button from the circuit board. However, in looking it over, I found that if the circuit board is pressed firmly while pressing the power button, it does get the thing to click. Upon reassembly, I found this to still be true. When the power button doesn’t work, if I squeeze the watch, face to back, and at the same time press the button, it makes contact.