OK, you need to make a few changes.
First, "Master" and "Slave" are only labels relevant to the particular IDE port you are using. They have NOTHING to do with other HDD's in your system. Any IDE port can support TWO devices, so each needs a unique identifier to keep them straight. The method is to use jumpers on pins on the back edge of the devices to identify one as the Master of the IDE port, and the other as the Slave. The Port MUST have a Master. Since you are using only one IDE device on this port and ribbon cable, its jumpers MUST be set to Master. (Oh, some HDD's have slightly different jumper settings for Master with No Slave, or for Master with Slave Present. Set yours appropriately.)
Next, the cable. It has 3 connectors on it. The Blue one on one end goes to the mobo port. The Black one on the other end goes to the Master device (your HDD). The Gray one in the middle is for the second (Slave) device IF you had one - in your case it will be empty. And, of course, there's a power supply (4-pin Molex) from the PSU to connect.
OK. With those set up you turn on power and immediately go into BIOS Setup. Many machines have you hold down the "DEL" key for this, but check your screen boot messages to be sure. When Setup comes on, look for where the IDE port is managed and make sure it is Enabled. Go back to the screen that shows you the HDD's installed and verify that both the existing SATA HDD and the new (well, old, really) IDE drive are detected properly. Now look elsewhere for where you specify the Boot Priority Sequence. I am betting it defaults to setting the IDE drive as the boot device when one exists, and that is not what you want. Make sure it boots from your original SATA HDD and there is NO reference to the IDE drive in the boot sequence. Maybe you want it to be: optical drive first, SATA drive next, and NO other device to boot from. Once these are set, Save and Exit, and the machine ought to boot from the SATA drive as it always did.
Now look in My Computer. Does the IDE drive appear there as a new storage device? If so, you may see all its old files and want to do something about that. If it does NOT appear there, let us know so we can advise how to Partition and Format the IDE unit so you can use it.