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Hi, I'm Mike G and I'llbeassisting you. Tryhitting the sides of the plug with a screwdriver handle. The reset may be hung up.
If the breaker reset and you tested the outlet for 120V, the GFCI must be defective. Replacement is the only alternative.
The GFCI plug having power should reset. Are you sure the outlet has 120V hot to neutral? You should be testing with a 2 wire voltage tester or plug in a lamp to check.