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repair a Yamaha MC 400

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    repair a Yamaha MC 400


    I have a Yamaha MC400 that i use as master controlling an organ sound module called Ferrofish B4000+ (with Ventilator).
    Worked fine, until the other day i unmounted the Lower keyboard to check, because there where 2 keys that had bad responde. It's not the first time i did it, but this time as i remounted and try to start it gave no response, only the bassdrum started doing some noise and that's it.
    I have here in Spain not a little chance to have technical support, it's any way and old organ, even i have the Manual service downloaded, my self won't be able to start it.
    I don't have any clue how to start it. In the service manual are some hints and shorttest but, those gave response correctly and though couldn't really start it.
    There is no power supply problem, all fuses are ok.

    thank you very much in advance, hoping to get any help.