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.
  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
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