I was fiddling and I pulled the NPG from the Unibus ribbon cable and the machine will boot now! But when I try starting RSTS timesharing (START command to the bootloader [Is that INIT?]) it lists devices it disables and hangs there. I can see an LED go high on the 2nd UDA board (The one that doesn't connect to the drives), stay high for a second, then go lo, strobe, and repeat. The READY lamp on the RA81 has died, so I can't really tell what's happening... I'll go RTFM tonight, but if anyone knows for sure what's happening, it'd be nice to know!