PCS CADMUS 9700 System power-up difficulties

Hello list, ? some years ago, I got a CADMUS 9700 computer, a rather heavy system of the 80's from a german manufacturer called PCS. The system is built around the DEC QBUS, but uses a Motorolla 68000 type CPU. Finally, I found some time to have a look at it. Unfortunately, I didn't went far with my exploration. After having taken an hour to find out how to open this thing (plastic covers without screws are NOT fun, when they seem stuck), I cleaned it as it was horribly dusty und rusty. It must have spent some time in an humid environment. Deconnecting the drives and?applying power to?the switching supply turned on?the blinkening?kight of the ?green "RUN" button, but pressing it did not do anything. Afterwards, I deconnected the supply, checked that power connectors within the chassis were correctly seated and reconnected the power plug to the power-supply. Now, the green light did not blink anymore. In fact, since then, nothing ever happended again. The system just seems dead. I guess that the supply has a problem. It's difficult to check it, though, without schematics. It has a small ribbon cable which connects to a small PCB with several ICs on which can be found the "RUN"-button. I have no idea, which signals that supply needs in order to enter a state at which it should be on. The small PCB with the buttons and ICs could also be defective. ?There is also a key-switch, but I played with both positions and it does not influence anything on my system. The systems seem rare. At least, I could find only little information on the net and not documentation at all.Has anybody a clue on how to power-up this thing?Are there other owners of PCS systems, who can tell me who the system behaves upon applying power to the PSU and if it is sufficient to press the RUN-button to turn it on? ? Kind regards, Pierre ? ------------------------------------------------------------------------------- Pierre's collection of classic computers : http://classic-computing.dyndns.org/