Where do i go for camera problems?

I Have a nikon D40. I've had it for a while and it was handed down to me from my uncle. And today i turned it on to take pictures for halloween and hen I press the button to take a picture I hear a strange squeaking noise and camera fails to auto focus and fails to take a picture. What do i do? Is it the lenses problem? And where can i go to get it fixed? (i live in san francsico btw)

You can call Nikon Service & Repair at 1-800-645-6687 and they'll give you an estimate and the phone number and address of the closest Nikon Authorized Service Center.