Laptops :: booting from cd on IBM Thinkpad

Just received my DSL CD. Am having difficulty trying to get it on my old IBM Thinkpad 755cd puter (Pent equiv 40mb ram 1 gig hd).
It has both FDD and CD using the same bay.
I tried F1 at power-up to change the start sequence but to no avail.
Any suggestions?
TIA.
PS: Works fine on my desktop (P2 233mhz 320mb ram). Just have to figure out how to install it on my slave HD. Tried Suse 10.1 but it crawls. That's the reason for DSL.

John: I went through this aggrevation on my thinkpad i1400. Learning to change the Bios boot sequence to get the CD-rom drive bootable. On your old thinkpad the CD-rom is not set up as a bootable drive. I did a lot of research to find that you have two options, change bios which works on some older thinkpads like mine, or create at boot floopy to get the CD-rom running and then it will install from it via the boot floopy. I was able to get my dsl to boot from the CD-rom by changing the Bios boot sequence. If this doesn't work for you then your model is so old that the CD-rom is not a bootable drive which was true of the earliest thinkpads. Mine was a 1999 thinkpad i series.

original here.