Replaced a light switch but new one does not work, why

Need a faster answer?
Check circuit breaker.
Test if line has power.
Check light bulb.
Neutral wires loose under wire nut.
Switch wired incorrectly?
Copy and paste following link to see basic single-pole and 3-way switch wiring:
http://waterheatertimer.org/How-to-wire-GE-15312-timer.html
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