ok...,I'll take it slow and answer your questions first.
1.An 'IDE' device is a Hard-drive,or CD-Rom,DVD-ROM,or CD-burner.Most computers are designed to handle up to 4 of these devices,in just about any combination,although it does need at least one hard-drive to operate as a real computer.
2.An 'IDE Controler card' plugs into the motherboard and will usually allow up to another 4 IDE devices to be installed.These are used by people with multiple numbers of hard-drives and optical drives ( CD/DVD-ROMs,burners ).
Do you know how to get into the BIOS screens?
Usually,all you need to do is press 'Delete' as the computer starts.
In the BIOS,you will see a general summary screen that will tell you exactly what the motherboard sees is connected to the IDE junctions.From what I can tell of your system,it will have 2 IDE devices; a hard-drive and the internal CD-ROM.
You may have to do a "Auto Scan" for the IDE devices in one of the other BIOS screens,but at some point it should show the CD-ROM in the summary.
Once it does show up there,you should go to "Save and Exit" and the computer will reboot.
Let me know if you are able to see/do this...