Hi igorsk,
Thank you very much for your suggestions.
1) with or without the cards - the reader doesn't start, is showing the "Starting up"- screen permanently. If I press the reset-button nothing happens(with and without the cards). If I press it and then slide the switch-on-button twice thescreen becomes white for a second, then again it says "staring up" and nothing happens.
2) If I connect the reader with the PC, the PC shows the sign that something is connected but if I try to open the device it says there is no device. So I can't get access to the internal memory of the reader. Some time ago if I opened ebook Library and then connected the reader without the cards it at least showed the internal memory in the ebook library but only marked with "error". Now this isn't shown either. Some time ago I tried to restart the PC with the connected device, but then not even the PC started anymore.

I had to set the PC back with "GoBack" to get the PC work again.
So I don't know what to do anymore. I'll try to buy a card-reader which can read the MemoryStick Pro Duo, as my camera (great idea b.t.w.!) only reads SD-Cards and the book with my annotations is at the Memory Stick Pro Duo.
Do you think I will get access to the book and the annotations with the help of a card reader? Will the ebookLibrary allow me to save my book with the annotations from there? This would be a great help for the moment, even if I'm really unhappy with this situation and the fact that it seems as if there won't be a chance to get the reader working again...
Thank you for your help, greetings,
Momo
PS: Excuse my bad English.