I would need more information on your PC but this is what I think you're talking about:
You should have two cables connected to the CD\DVD drive and the hard drive. One of these cables is the data cable and the other would be the power cable. The data cable would be a smaller cable connecting to the hard drive and to one of the Sata ports on the motherboard while the power cable would come from the power supply and connect to the Sata hard drive.
This would be the same for the CD\DVD drive. This only applies if these are Sata drives and not the older IDE drives.
The Sata connectors have a L shape design on one end so they cannot be inserted in the wrong polarity.
You may not need all the power cables coming from the power supply as some may be for any added drives that you may not have.
If the power cable is disconnected from the hard drive, the system would not boot. You might want to check the memory modules also, to make sure you have them inserted in the slots completely.
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