I have been trying to upgrade the video card that came with my HP Pavillion HPE H8-1220. I have bought (3) different cards and no work. I remove the existing card and software, but once I re-boot with the new card the screen either goes black, or it locks up at the HP start up screen. I have a M3970AM-HP (Angelica) mother board, and I just need to know what card will work with my system. I am running Windows 7 Home Premium, I have 14 GB of Ram and I upgraded the power supply to 725. I just don't want to buy and return a 4th card, and my current card is slowly dying. And help would be appriciated.
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