So you have another distro working and booting fine, right? And you want to add a knoppix poor man install to the existing lilo menu, is that it? And that hdg drive is mounted under /mount/data3...

I'd suggest the following:

Code:
image=/mount/data3/linux24
    initrd=/mount/data3/minirt24.gz
    vga=791
    label=linux.knoppix
    append="nomc eapm=power-off"
You may have to try several times, adding cheatcodes to the "append" line ("fromhd=/dev/hdg" might speed things up).

Also how come you've got hde and hdg instead of say hdc and hdd? Does this system have som RAID controller, or an extra IDE card? That piece equipment might be your problem... Dunno, lets' try the above 1st.