I Own This Unit And I Tell You What I Love It And Cant See Myself Using A Computer Anytime Soon. You Can Open It Up And Check For Loose Connections By Removing The Screws Shown Here
Youll Wanna Remove The Disk Drive Cover First Indicated By The Blue Dots. Once Inside There Arent Many Connections To Check But Now You Can Unplug The Hard Drive And Try Powering The Unit On Again. See If You Get The Same Result. Once Thats Done Plug The Hard Drive Back In And Try Again To See If It Works.
If It Doesn't Call Roland Theyre Costumer Support Is Awesome And They Can At least Give You An Idea Of What May Be Wrong.
Roland Corporation U.S.
5100 S. Eastern Ave.
Los Angeles, CA 90040-2938
323-890-3700
Also Very Helpful Is This Guide On How To Remove The Hard Drive And Replace It Found
Here.I Hope Some Of This Helps.