11/34 sanity check

While I was waiting for the Ridge's disk to dump over a 9600bps serial port, I finally got a chance to work on my 11/34. Picked it up last summer and it was in good shape but the power supply was completely dead. I've rebuilt the supply and last night I worked out the last few kinks. So at this point all voltages are spot-on, the AC LO and DC LO signals are high (these are active low, right?) but I can't get the machine to respond at all -- the "DC ON" and "RUN" lights are lit up brightly, and the "SR DISP," "BUS ERR," and "MAINT" lights are glowing dimly. The status register display is dark. The system does not respond to any keypresses on the panel. I'm getting better with UNIBUS stuff but I wanted to run this past you guys before I whip out the debugging tools and start tracing things. I've taken it down to a pretty minimal configuration, sans any memory or other stuff. Here's what I have in the main backplane (all others are disconnected for the time being) from right to left: Slot 1: M7266 (CPU) Slot 2: M7265 (CPU) Slot 3: (AB) M9301 (bootstrap terminator) / (CDEF) M7859 (front panel board) Slot 4: empty Slot 5: empty Slot 6: empty Slot 7: empty Slot 8: empty Slot 9: (AB) M9302 (terminator) The "empty" slots have Grant Continuity boards installed and the NPG jumpers on CB1-CB2 are all present on the backplane. I've confirmed that all the right voltages are making it to the backplane (and I've cleaned up those damned Molex connectors as well, just to be sure). Is there anything I'm missing? Anything I should try? Does this failure mode sound familiar at all? Thanks as always, Josh