That should be the fuse reset button, it's okay to push that.
Check to see if you have the 120/220 Volt selector switch on the back of the power supply. Unplug the computer and switch this to 220V and then back to 120V. Then plug back in and turn the computer on. Then see if the power supply fan moves.
You may also need to re-seat the cable connections inside the computer if the power supply does not turn on.
Make sure to unplug the power to the computer first. Then open and unplug the power supply. Re-seating the cable is just the main plug that goes from the power supply to the motherboard. Unplugging the cable and back in will work fine.
Then close the case cover and plug the power back in. Let me know if you hear the fan moving.