"Then I tried starting with Windows 2000 Advance Server CD to do a repair (R) and receive “Did not find any hard disk drives installed in your computer”. Which makes me think it has to do with the RAID driver." It does, but the Windows CD does not have the drivers for the PERC ... you need to provide it for Recovery Console (which is an "offline" repair tool) just like you would if installing the OS directly from the OS CD.  SMTD will not work for Recovery Console, so you have to take the "long way" around and do it the old-fashioned way.  You have two choices: 1. Provide the driver from floppy at the F6 prompt after booting to the Windows CD, or 2. Use nLiteOS.com to integrate the driver into the installation files (which will create a new installation CD). So, since you don't have a floppy drive, you will need to go to nLiteOS.com and download nLite and follow the examples/prompts to integrate the driver. [URL] (download and run to extract before using with nLite)  
Earlier this year with the help of this forum I created an SMTD DVD that was used on the above mentioned server. The server has been up and running until a few days ago as it can no longer find the drive. This server is setup with RAID 1. My questions;
Dell Poweredge 1950 server running Windows 2000 Advanced Server lost RAID 
driver.