I would _definitely_ start by pulling _all_ the cards you can, to get down to the simplest possible configuration. Once that works, start adding things back in, one at a time. If that configuration doesn't work, first try the obvious things (clean and re-seat, check voltages, etc). If that doesn't get it running, it's time for a oscilloscope or logic analyzer. (We can help you through that.) So I'd start with the CPU (M8266/M8265), front-terminator/bootstrap ROM (M9312), the front console card (M7859), and rear-terminator (M9302) (which you need for grant turnaround, see next paragraph). That's it. IIRC, the /34 will complain if the bus grant chain is not complete (I really need to look at the prints/ucode to understand why this is so - other -11's will run basic functionality fine with an interrupted grant chain), so plug in grant jumpers in every unused slot. Also, check the backplane, to see which slots have had their NPG jumpers pulled, and either i) use a G7273 jumper (the dual boards which contain an NPG jumper as well as the BR jumpers) in those slots, or replace the jumpers. I _think_ the machine will be OK without any memory, but I don't have a running 11/34 to test that on. (Only my /04 is running at the moment.) I can plug my /34 cards in and try it, if that will help. But maybe someone else knows. So maybe you'd have to add a memory card, but that would _definitely_ be the biggest configuration I'd try until the basic machine is working. You can examine the MMU registers in the CPU to check that the bus/console etc are working - first read, then write. And IIRC the CPU general registers are accessible from the bus too - I know they are in the -11/04 (which uses the same front console). Noel