How to disable onboard video card in american megatrends

Hello,i just bought an ATI Fire GL video card and it is working but i'm having issues with it. if i try to use google chrome or play my dvd rom game my monitor blacks out and says no signal. how can i fix this?
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More about disable onboard video card american megatrends
  1. Did you install the right drivers from AMD's website? Did you first uninstall the old drivers?
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