The answer to 'my GFCI outlet won't turn on' is that there are several common causes, including a tripped circuit, faulty GFCI, or wiring issue. GFCI outlets are designed to trip when they detect a ground fault, which helps prevent electric shocks. If the outlet won't reset, it's likely due to an underlying problem that needs to be addressed.
Some common symptoms of a GFCI issue include the outlet not powering on, the test/reset buttons not working, or the outlet tripping repeatedly. Potential solutions include resetting the GFCI, checking for ground faults, and inspecting the wiring. However, if you're not comfortable troubleshooting electrical issues, it's best to call a licensed electrician to diagnose and repair the problem safely.