Gigabyte hd 7870 not compatible with a biostar A88OGZ ?

I have a Biostar A880GZ motherboard, with a 2.8 PhenomII CPU, 8GB RAM (2 4GB G.Skill RipJaws) and a modular 530w Power Supply. I bought a Gigabyte HD 7870 and it does not show image through the only possible way i have at the moment, DVI to VGA adapter. I wonder if the GPU is compatible with the biostar A880GZor if its a common problem. I'm considering updating the bios, but i'm afraid of screwing that up since i don't have experience on that matter. Other thing I'm wondering, that motherboard is 2.0 PCI and the card is 3.0, would that make them incompatible ? And for last, thinking alternatives, I'm doubtful about the 530w power supply, should i change it ?

Any help would be very much appreciated.
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More about gigabyte 7870 compatible biostar a88ogz
  1. This guy was having similar problems, i cannot find a solution oon the web.
    http://www.tomshardware.com/forum/385831-33-gigabyte-7870-black-screen-boot
  2. PCIe 3.0 is backwards compatible with PCIe 2.0, no problems on that. Can you give us the specific model of your power supply? It might also be a defective card but let's not jump to that first.
  3. RX-530SS ATX Power Supply
    Thanx
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