These run on software on the Hard drive. Any power outage (planned or not ) can result in system failure. It's very common for them to not boot after a shutdown. Any tech who has serviced Medleys for any length of time knows to bring 2 drives when going to work on one. And no, there is no controlled shutdown procedure that can prevent a boot failure next time. You really take your chances when you unplug these, unfortunately. I think your right, check the fuse first. If not, a replacement drive usually fixes it nine times out of ten.
Aable sells drives for these on their website.
www.aablecommunication.com. ------------------