The machine sounds a scary mix of Unibus and Qbus peripherals (a real Heath Robinson!). Given you cannot deposit/examine memory and get correct results, the bootstrap will halt because it runs some diagnostics (including memory) before it attempts to boot a device. The first step it is to strip down the system to the first system unit. You can still leave all the cards in, just remove the unibus jumper from slot 9 and move the terminator M9302 into slot 9 (a-b). For good measure, I'd also remove the M8217 from slot 9 (c-f) and put in a bus grant continuity card if you have one. Since it's (now) the last slot, it shouldn't matter if the grant card is missing. Then try your memory deposit/examine test. I'm assuming here that you have tested all the power supply voltages as it appear that you have a fairly loaded system. Have a look at the following site for more hints:- http://www.psych.usyd.edu.au/pdp-11/hints.html