I thought I wanted to update some info for the techies that maybe look into this:

When the unit WONT turn on..


The red powerlight is off. And the orange eject light in the eject button is dim and how to you say flashing/blinking? I mean not from on / off .. but from dim to a little brighter.. Its impossible to eject or hold eject - nothing happens.. I can then pull the batteri or when driving actually after up to 20min.. It will suddenly turn on.. but with the bugs..

I talked to Kiwijochen which advised to open the case again and closely study for corrosion and water traces.. Ill do that later.. AND try to flash again again the oldest firmware I could get my hans on. v21(.1).