Computer shuts down when plug in power for monitor on the motherboard

I replaced the mother board for a Gateway 505GR, intel 915g, and all went well until I plugged the power cable into the motherboard for the monitor. Initially the system started to boot up, then the computer shut off. I have a new Power unit, and it does the same thing. I have unpluged the monitor cable, and it continue to do the same thing, runs for a few seconds and then shuts down. I have unplugged the harddrive and the minute I plug the power cable into the motherboard for the monitor the computer shuts down. I have not unpluged the other drives. help.....
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  1. mkosier said:
    all went well until I plugged the power cable into the motherboard for the monitor.

    Yeah, that would definitely cause problems...

    I think you're a bit confused in your use of terminology. Please look at these pictures of the inside and back of your computer, and try to use the correct terms to specify what devices are connected to what.
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