Unable to shift into 5th or reverse

Hey, this is my second post, my first was the exact same post in the specific Focus area. At any rate, here is my question.

I bought three weeks ago a 2005 Ford Focus ZX3 5-speed Manual, last night I took my girlfriend out to an empty parking lot to teach her how to drive a manual transmission. The car has never had any problems with shifting whatsoever, infact I always thought the clutch was a little too soft. Anyway, she did extremely well with her first time, and only stalled the car twice, though they were pretty bad stalls. We never got up to fourth gear, since we were in a parking lot, and it shifted fine the whole time. However, when I got back in to drive to pick up a movie, it wouldn't go into reverse to pull out of the parking spot. So I let it coast out of the spot since it was on a hill, and we took the highway to test if it needed to be at a higher RPM to get into the slot. It wouldn't go into the slot to select 5th on the highway either. So essentially I now have a four speed manual transmission with the 5 speed gear ratios, and no reverse. I am going to take it into the dealership tomorrow, but I wanted to see if was something that I could possibly easily fix. At any rate, I appreciate any help that can be given, and thank you for taking the time to read this.

Sean

If I remember correctly, like the T-5 5 speed your tranny 5th and reverse share the same shaft in the tranny, the case will have to be cracked open the syncros replaced.

i took it in, and apparently a cable broke. So they gave me a rental car, and my car should be done in a couple of days from now. Thanks for the help guys!