Thank you for help.
Factory reset works. I pressed the light button after i press the pinhole, that was the mistake.
Installed it again, it was the same situation.
BUT, i found a way to open the menu: poking in the upper third with tree fingers. Nice gesture
Is this a "normal" issue or is there a problem with my installation? Have firmeware 2.8.1 and used fmon to start the KOreader. Telnet and ftp were enabled first.
Also the on-off switch seems to work only sometimes. I try to find out details.