What you might want to try, if you have them both connected to the secondary IDE, is jumpering both as CS using an 80 wire IDE cable. Your new drive probably came with one but you can tell the 80 wire cable by the "blue" connector at one end (motherboard connection). With the old 40 wire IDE cables, all the connectors were the same color, black. After you've re-jumpered them, enter setup again and set them both to "Auto".
If you can't get them to play nice together on the same IDE, a common problem, move the new DVD drive over to the Primary IDE as Slave. Technicaly, it slows data transfer from the HD down but not something most people would even notice.
Most CD\DVD drive makers recommend you don't install two on the same IDE as well.
Edited by HitSquad, 31 May 2006 - 02:27 PM.