One night, I turned on my LXD55, to find that it started slewing in Right Ascension and wouldn't stop! Luckily, after tooling around with it, i found a way to fix it. First, while the mount is still off, you need to remove the R.A. gearbox. Using an American 3/16 hex key, hold the gearbox with one hand, loosen the screw until you can remove the box.

After the Gearbox is off, the gears will run but the mount won't move because it is detached from the mount. Turn on the autostar and under SETUP scroll down to RESET and press enter. After a second or two it should stop slewing. You do have to re-enter information but it does fix the problem. The software upgrade for autostar is what might be the cause of it. Hopefully this will help you if you ever encounter this problem.