HELP Xps 400 RADEON HD 5770 problem

Im trying to upgrade my xps 400 for gaming. I upgraded the power supply from 375 to 550 and im having problems with my computer recognizing the new graphics card. I was told to try disabling the onboard graphics is this a good idea? anything else i can try?

Thanks,
Dave
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  1. My computer

    Dell XPS/Dimension 400/9150, Processor Pentium D Presler 930,3.0G,2X2M,C1, Hard Drive 1TB, 5gb ram, 550Watt power supply
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