No power when IDE cable plug into mainboard

The motherboard I'm working with is a K7 Pro ATX IR3 Mainboard. Whenever I plug in the IDE cable to the mainboard, it seemed that there is no power coming from the power supply. I tried this with a cd-rom and the light isn't lit or do anything. As soon as I unplug the IDE cable from the mainboard, the CD-ROM works...meaning I can push the button for open and close. All the lights, HD and Power lights, on the front of the case are not even flashing or turn on.
If anyone has any suggestion I'm greatly appreciated.
ljCharlie
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Sorry for the confusion. In this situation when I talked about cable, I mean the IDE cable or floppy cable and not the power supply cable. I have one floppy, cd-rom drive, hard drive, sound card, and a video card. I believed the power supply is a 400 watt, although I'm sure. I just purchased this last week so I am pretty it'll handle what I am trying to do. When I turn the computer on these are the things I believed that are running with all three cables one end plugged into the mainboard and the other end to the devices such floppy, hard drive, and cd-rom.
cpu
cpu fan
case fan
D-LED light is on
Devices that are not runing with all three cables plugged in to the mainboard and the other end to the devices such floppy, hard drive, and cd-rom.
floppy drive
cd-rom drive
hard drive
HD LED light
Power LED light
Now, if I unplug all the cables from the mainboard or from the devices then all the devices seem to have power coming to it.
ljCharlie

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No power when IDE cable plug into mainboard

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