The answer to 'how to fix surge protector' is to first unplug the surge protector from the wall outlet. Then, check the surge protector's indicator light to see if it is still functioning properly. If the light is off, the surge protector has likely reached the end of its lifespan and needs to be replaced. You can also use a multimeter to test the surge protector's ability to protect against power surges.
If the surge protector is still working, you can try resetting it by pressing the reset button. If that doesn't work, you may need to replace the internal fuse or circuit breaker. Always follow the manufacturer's instructions when servicing or replacing a surge protector. If you're not comfortable doing this yourself, it's best to contact a licensed electrician to inspect and repair the surge protector.