It's probably not possible, I'm afraid. Stuck-in-standby seems to (generally) mean that the hard-drive on the sky+ box has failed. It may be possible to remove the drive, and get it to work for a short time in a PC and use some software called "Copy Plus" to copy the recordings to a new hard-drive which should then work in your sky+ box, however I wouldn't bet on it :(
Proinnsias, December 2007