Intel HD 3000 graphics is integrated inside the Intel’s 2nd-generation processors (known as “Sandy Bridge” processors), it works only with Os X Lion and Mountain Lion and probably will work with new upcoming Os X 10.9. The VGA port is not working (Macs don’t use VGA ports). You have to use DVI or HDMI port. If you are not already using chimera bootloader, make a fresh install of Os X Lion or ML with latest Unibeast bootloader and Multibeast after install utility.
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