N9 revived again!!!

I found the thread you mentioned
http://talk.maemo.org/showthread.php?t=91722
and thought well, give it a second try...

So I let the battery plugged off for ~10min and replugged everything - and got a LED blink.. The joy was short, while reassembling a sudden cloud of electronic dust and the typical short circuit smell came out of the top right corner. I unplugged as fast as I could and saw the display cable (the one with the wide plug) was damaged on the outer side of a bend and had gotten contact with the metal cage in the housing.

I couldn't break any more so I just isolated the damaged cable area - put it back together and voilà - up and running.

The damage must have occured when I opened the device 2 months ago.

I thank all of you, appreciate your help very much.