I've read all the other posts regarding problems to get sound and I know my way around synthesizers and definitely have no sustain turned down or so. Here is the problem; At the moment of turning the unit on, it is possible to use the keys to generate sound for a second or so, then it fades out quickly! After that it will stay completely silent, no matter what you do. Except for: turnning the LFO to "Amp", then you can get a sound out of the vco, and whilst doing this I can conclude that the filter are working, the pitch is working, and even changing the keys with the keyboard work. But the keys can never "trigger" any sound - I hope you can follow what I mean. One more thing, the Amp Envelopes seem to be utterly non-functional, and the green lights never come on. (I only know they're green because I read that on this forum). The filter envelopes the same, nothing.
Could it be something lose inside? I guess the keys are not completely disconnected, since you can choose the note for that initial second of turning the machine ON.