If there is no Linux partition on the first disk, but there is an extended partition, the LILO boot sector can be stored in the partition sector of the extended partition and it should be booted by the original master boot record or by a program like BOOTACTV.
The program activate, that accompanies LILO , may have to be used to set the active marker on an extended partition, because MS-DOS' FDISK and some older version of Linux fdisk refuse to do that. (Which is generally a good idea.)