T20 hard drive replace with one from R51 and won't boot

[cbuck1]

I had the HD crash in my T20, so I replaced it with the one from an old R51 and it won't reboot. I'd like to reformat the disk and load Win 2K, but I have no floppy and no bootable Win 2K CD. I've got an old T20 recovery disk that says it's bootable, but when I put it in the drive and try to boot, I get a message that says there is no CD drive. But the drive is working because when I put in my Ultimate Boot CD, it works. What can I do to get this thing working again?

Thanks,

Craig

[sjthinkpader]

Move the Ultrabay CD drive boot order up higher or use an external USB CD drive.

[cbuck1]

I've already done that. It accesses and boots from my Ultraboot CD, but when I try to use my rescue CD, it can't find the drive. I suspect it has something to do with the fact that it's a Win 2K rescue disk but the drive has Win XP on it.