I had my bb2 machine with 2.0 cpu and switched back to 3.0 cpu for Ferris Bueller. Did ram clear - gave an error message and machine rebooted itself to ram clear again and succeeded in ram clear when machine rebooted, but top monitor stopped displaying anything. Anyway, tried to install Ferris, but when it came to setup menu (top monitor still black at this point), and I tapped machine options, the machine reset itself. I am guessing that it is not seeing top monitor and it doesn’t like that, but I am not sure. I took off both monitors and connected the blank top monitor into middle slot to see if something might be wrong with the power harness up top, but screen remained blank and unworking in new position - so I believe it is something wrong with the top screen. I noticed there is a fuse on the back. Is it possible to the fuse is blown, and if so, can that be replaced instead of whole screen? If so, how is the fuse removed? I tried twisting gently both ways and got the black cap portion to come off, but I don’t know how to get the whole fuse out. Any advice from anyone out there?