The answer to 'GFCI outlet not working' is that a non-functioning GFCI outlet is typically caused by a tripped GFCI, wiring issues, or a faulty GFCI device. Symptoms include the outlet not providing power, the GFCI test/reset buttons not working, or the GFCI tripping frequently. Solutions can include resetting the GFCI, checking for wiring problems, or replacing the GFCI outlet.
For a GFCI outlet that won't reset or keeps tripping, first check for ground faults by unplugging devices and testing the GFCI again. If the GFCI still won't reset, the outlet likely needs to be replaced. Replacing a GFCI outlet is a straightforward DIY task for most homeowners, but if you're not comfortable working with electrical wiring, it's best to call a licensed electrician.