No operating system found?

Yesterday, my system stopped in the middle of the shutdown procedure. The filesystems were not unmounted at time, afaik. Now, during boot I get "no operating system found". That might be explainable as the file system were not unmounted, but... I get the same message while using knoppix.... The bootorder is first removable media, CD, HD. What may cause this, is the MBR just correct, and does that influence booting from CD with knoppix?? Looking forward to the ultimate trick! -- Richard Bos Without a home the journey is endless