I just inherited the same treadmill last night. I have come online to try and find a key & a manual. I am using a piece a cardboard to get it to come on. It also did the same thing you described. All the lights came on and I was able to incline but the belt would not move. I knew that it had not been used for several years and figured it had just froze up. I kept turning it on and off while moving the belt manually. After a few hours it started on its own. I have now used it twice. Keep trying!!!
Cindi
January 2007