Furnace Situation
If the GFCI won't reset then it probably should be replaced OR you may have a short somewhere that is tripping it. By the way, the GFCI has two buttons in the middle (one for test black and one for red reset or vise versa, can't remember (getting old)) that is Krazeehorse is right about the fuses and/or circuit breakers. Check them all to make sure none are tripped.