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2006 mac pro no video signal to monitor
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No video signal from 2006 Mac Pro
Hello, I have a 2006 Mac Pro I use for a video ministry. I tried to install Sierra, which I now know my Mac does not support. I clicked on Sierra install icon, system restarted with no video signal on monitor. I know all works because put in a hard drive with Windows XP (all I had to test) to...