State A: the state as I received the machine initially (plugged: logic, back of the case, hard disk, floppy) Flick the power switch on, press soft power on the keyboard - get a brief led flash, then nothing.
State B: worked for a few days, but required plugged in prep HOURS (plugged: logic, back of the case, external scsi drive) Powers on normally, emits a very high frequency noise but otherwise works.
State C: this week before and after recapping the logic and analog boards (plugged: logic, back of the case) No LED flash, just a very soft power up sound in the CRT circuitry presumably, black screen no matter what I do.
State D: latest attempt (logic out, back case with fan in, hard disk out). I got a power up of the fan for a second, then power down, then power up, then down. After a minute or so, it can stabilize itself to normal operation. Turning it off and on again does not repeat that struggle.