11/34a issues

Okay, so I FINALLY worked out my BA11-K power supply issues and got everything sorted out and installed again. However, I'm back to where I started when I got this thing (which I never got past) - I turn it on, the display comes up at 173536. However, whenever I try to EXAM anything, it displays 000000 and the BUS ERR light comes on. I can clear, but I get that BUS ERR no matter what I do. I haven't got a serial console connected to it yet - I got this info by going through the 11/34 diagnostics in the manual. Here's my setup: BA11-K box DD11-PK backplane UNIBUS layout: A B C D E F M8266 M8266 M8266 M8266 M8266 M8266 1 M8265 M8265 M8265 M8265 M8265 M8265 2 M9301 M9301 M7800 M7800 M7800 M7800 3 H222A H222A H222A H222A H222A H222A 4 blank blank blank GRANT blank blank 5 H222A H222A H222A H222A H222A H222A 6 blank blank blank GRANT blank blank 7 M7850 M7850 M7859 M7859 M7859 M7859 8 M9302 blank blank GRANT blank blank 9 I've tried switching some boards around, no help. All grant cards are installed where you could read FLIP CHIP from the processor side. I have NO idea what's wrong. Is the memory possibly bad? That's the only thing I could think of. Any help, as always, would be much appreciated. TIA Julian