I'm getting a Norman P800D and P2000D that have been in the used camera shop long enough I'm getting them 90% off the normal used price. I'm acting on the assumption that this means it's been years, possibly a decade, since they've actually been powered on. For a shorter storage period, I'd just plug them in, switch them on, and let them idle for an hour before popping them. With this much, much longer sleep, I don't have any idea how to maximize my chances of NOT blowing them up when the plug them in.

Anyone have a good answer?