Hi BillB
I would like to hear more about the CNC machine you are using with OS/2, like model , what kind of interfaces (special cards) does it has, pictures, and what drivers and software does it uses for CNC. Even if you can share the config.sys would be interesting to me. I don't know why but I would love to have more documentation on OS/2 on industrial environments.
About your issue, I understand that you installed OS/2 Warp 3 and you reached the end of the installation on your HDD, but once you unplugged the IDE CD-ROM, it would not boot anymore, right?
1) Maybe there is something wrong with the master/slave jumpers on the HDD.
It may be interesting to check the jumpers on the HDD and also to see if the BIOS recognize the drive without issues.
Please let me know more information about the machine and software, I really want to know more about it.
Regards