I had a problem installing Novell Open Enterprise Server on Dell Optiplex 755 or 620. It was the drivers. The problem is that the installation runs fine from CDs, but when it finished, the operating system could not find the hard disks. It used the module IDEATA to put several slots for drives, however it does not run.
I could run it when I changed to the drivers from the page http://developer.novell.com/devres/storage/drivers/
The hard drives are up, voila. Now, It works fine.