You probably need the change the jumper on the hard drive itself. The jumper looks like a thin little cap that covers a set of pins on the back of the hard drive. You should see it next to when you power supply connects and most drives will usually have a diagram on how to change the jumper from a slave to a master.
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Along with habib_101s solution, make sure it is on the end connector of the IDE cable, The middle connector is always the slave drive. Also if the IDE cable has a red or blue connector on one end - that end plugs into the motherboard - don't try to reverse it , especially if you see a small hole in the cable near the colored connector.
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