Thanks for reply - of course it's possible to boot from a CD drive, the old TEAC CD drive works this way.
But if I change the drive and install the LG DVD, it does not boot, only an error occurs which says "FATAL" - that's it.
I tried to install Win XP by using start disks and then continue with installation from the DVD drive, but I tried it 3 times, and it does not work because every time the installation is nearly finished Windows says "System time is faulty" - don't know why, but somewhere during installation from the DVD system time in the BIOS is reset to 1998 (CMOS battery is new!).
The only way it works is to reinstall the old TEAC CD drive, boot from and install XP with the drive and after a finished installation change the drive to the new LG DVD.
This is very uncomfortable, so I try to find a way to set the LG drive fixed as "Master".
Maybe you're right and theres no longer a jumper, I guess in this case I should sell it to a person with a newer notebook which has no troubles with cable-select drives and try another drive.