To remove boot time (& shut down) splash screen on Pre-GRUB2 systems:
look for the line that contains the kernel image
remove splash and quiet from there
This should work fine on all versions of BOSS GNU/Linux released upto now.
Before you do this be sure to backup menu.lst just in case you need it:
#cp /boot/grub/menu.lst /boot/grub/menu.lst.dist