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Hello everyone at OS X Latitude, I have added a PCI graphics card to my Dell Vostro 200 Desktop. I got a Nvidea geforce gt 610 pci express card from PNY. My Windows 7 Professional boots fine, but my Mac mountain lion stopped working. It is stuck at [ PCI configuration begin ]. If I plug it into the original on-board VGA port, it works fine. What is the problem behind this? I am using a 1024MB DDR3 card. I know Hervé wrote in his Vostro 200 guide to use a 2GB card, but it was too expensive to I just got a 1GB card. Is there problem because of the Windows. I am using GUID partition layout. First, I installed Mac, then I installed Windows. Somehow, after installing Windows, the computer boots up to Windows by default. The only way to get to Mac is to plug in my myHack USB installer and boot using that. Again, USB booting worked using on-board video card. Is there a problem because I am booting via USB installer to my Mac partition, or because of some graphic card problem. I also remember that right after my Mac Mountain Lion installation(which was before I got my graphics card) that it said Installation Failed. I just ignored it, because it appeared that it was working fine eventhough it said Installation failed.Could that be the case? Thanks vgupta