HELP Xps 400 RADEON HD 5770 problem

[dburns87]

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

 

[dburns87]

My computer

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