From the screens it seems you crashing into the monitor (code). Either the heads are dirty on the drives, or the disks are not bootable. Not all disk will boot straight up. Sometimes they are a data disk. Sometimes they go bad.

It could be other things but with out a known good disk you can not tell. Try after you booting the system master disk. That is after the red light goes out. Leave the disk in and type CATALOG in caps. If it comes up with a list then it is good. No take that disk out and put in on of the others and type CATALOG again. See if anything comes up.

Take Care