Hello and thanks for your replies !!
It's not an intel iMac, it's a G5 one so no bootcamp for me . I managed to log to Suse but only through the bootable install dvd. (booted from the dvd and selected "install" . Once the install GUI was up i aborted and magically the linuxrc menu appeared then i selected the 4th option " Start installation or System " and then the 2nd option "Boot installed system".)
There must be an easier way to boot to Opensuse !!!