Your cd rom should have at least two cables connected to it.
Cd rom ribbon cable.
This cable has one side of the cable that is red or blue indicating pin 1.
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This side of the cable often points to where the power connects to the cd rom drive.
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The ide or sata cable should also connect to the motherboard or another interface card and the power cable should connect to the power supply.
A molex power cable and an atapi ide or sata cable.
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Finally connect the molex style power cable to the back of the cd rom drive.
Disconnect the cable from the back of the cd rom and reconnect it.
Next connect the 40 pin ide eide interface cable large gray ribbon cable to the back of the cd rom drive.