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AMD Radeon 5770 1GB, what are the two mini ports for and how can I set up a second monitor. I am macpro using OS X 10.6

Question asked by hookster on Apr 26, 2019

AMD Radeon 5770 1GB, I am having trouble setting up a second monitor. Purchased an adapter, mini dvi to dvi and it did not work, this is for macpro mid 2010 with OS X 10.6 and 10.8.. no signal message appears on second monitor. Any thoughts would be appreciated.