I'm assuming that hde is really correct (do also check it in your /etc/fstab) and not hda or something else but hde
Well, write in SEPARATE LINES in /etc/lilo.conf
disk = /dev/sda
bios = 0x80
disk = /dev/hde
bios = 0x81
and run lilo again.
Well there is a lot of more stuff about lilo configuration (and lilo versions etc,..) to check and to test, etc,...
Btw the default setting would be to use your ide drive with linux as boot device and configure lilo
But maybe my suggestion will help.