I still would not panic at 5 weeks. Give us more info. How long have you had this snake? Is it captive bred or w/c? What else, if anything, has changed or happened? Is the snake fat and sassy, or on the thin side? What else have you tried to encourage the snake to eat? Was/is there a shed cycle during this period of time????????????????????? A healthy snake can (and sometimes will) go MUCH longer than 5 weeks without eating.
But "healthy" is the operative word. Any other reason to think that this snake may be ill????????????? Duffy
Oh, yeah...You say the temps are right, but are the temps in your home getting cooler with the season, and are we talking natural lighting (does the snake know that the days are getting shorter?) 