No reverse help. Options

[bccentaur3]

I have a 2nd gen 3sgte swap with my factory s54 trans. I am running the stage 4 competition clutch.

So today I took my car out and went to my little cousins bday. I let a buddy of mine test drive my car. Good thing guy came back with the car in one piece. So anyway I had to put the car in reverse to keep from blocking the driveway and it backed up just fine. We drove about 30 minutes to the lake for a bbq. The car sat for about 5 hours and when I had to back up, I couldn't put it in reverse. No matter how much I giggled and how hard I tried to get it in, it won't. I checked my shifter cables already and they are fine. I mean all my gears go in fine, except for the reverse. Should I just buy another s54 or do you guys think its clutch related. I don't have money because people were right about the maintenance on the 3s. I have been spening money here and there tidying things up and now this happens.