Is it possible that my GFCI receptacle is bad?
When you say "the GFCI is NOT tripped", are you referring to a GFCI breaker or GFCI receptacle? If you're talking about a receptacle, have you checked the breaker/fuse to see if it has tripped/blown?

It's entirely possible that the GFCI is bad. Though it's impossible for anybody to inspect the wiring through the internet, so that's about the most definitive answer anybody will be able to provide. Your best bet would be to contact a local licensed Electrician.