MicroVAX II problem

Hello all, I purchased a MicroVAX II about a year ago. When I went to the office where it was sitting, the original owner, a former DEC field service engineer, and myself powered the machine up. VMS came up successfully; no problems there. The system is in a BA23 rackmount chassis, and contains a MOB Systems quniverter, to connect it to a BA11K Unibus chassis via two large ribbon cables. The system contains also the following boards: M7658 - 16-bit parallel I/O with DMA and block mode functions M3104 - DHV11-A 8-line asynchronous DMA MUX M7651 - 18/22-bit DMA general purpose parallel interface Also, a TQK50 TMSCP controller and an RQDX3 ST-506 MSCP controller. The system has for drives an RD54 fixed disk and a TK50 tape drive. Anyhow, once I got the system home and cabled everything back according to the notes/pictures taken of the original installation, the system would not come up, and the DC OK light on the front panel would not light. I checked and re-checked the cable connections, re-seated all the boards, still no-go. Realizing I would not need the Unibus chassis, as it contained no cards other than the one needed to connect it to the uVAX II's Qbus, I removed the Qbus part of the quniverter. This solved the DC OK problem, and the system would actually begin its power-on tests (F...E...D...C... etc.), however, it hangs at 3. From what I could find in DEC documentation, this is a "spurious interrupt" problem, and the docs gave no clue as to how to go about tracking it down to any specific part of the system. I have tried pulling all the cards except for CPU and memory, to no avail. I tried installing the RD54 in a VAXstation 2000. It boots VMS successfully when installed in that system, so I know the drive is good. Unfortunately, I recently moved and could not keep the BA11K due to space constraints, so I have since parted with that chassis. I'm completely stumped at this point. Any suggestions? Thanks much, John Willis