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screen flickers after start up

I just upgraded my GPU from a 650 to to a 7950 it was all working but then I uninstalled my nvidia drivers then when I went to turn on my computer my screen just kept flashing black with no display I am pretty sure its the drivers but I have no clue on how to fix this.
Thanks for reading.
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  1. Best answer
    put back the 650 in uninstall all the nvidia driver then stop system remove the nvidia put in the hd 7950 and let windows do the update ,the flashing means it do not receive video signal .
  2. So just uninstall the nvida drivers and it will be ok? I have my card in right now anyways
  3. yes you have to remove the nvidia driver before removing the card from the system after the system shut down put in the radeon and let system detect it .
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