Mac Pro (2008) Dual Display Issues

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Mac Pro (2008) Dual Display Issues

Hello All,

I have a Mac Pro 2008 with an ATI Radeon HD 5870 installed into PCI slot 1. I also have DosDude's Patched Mac OS Catalina on this machine. The current display I am using is an Apple Cinema HD Display Aluminium  23-inch (1920 x 1200). i wanted to have a Dual Display setup, so I pulled out my old ViewSonic LCD monitor. I connected said monitor via a VGA cable and a  Mini DisplayPort to VGA Dongle. However, The computer doesn't detect the ViewSonic Monitor. I have tested the ViewSonic monitor, the Vga cable, and the Dongle. all three peripherals are funcitional. I don't know what's going on. If anyone knows, please commnet

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Joined: Dec 16 2003 - 15:14
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I don't know about that card

I don't know about that card specifically, but it may be that it doesn't pass a VGA signal, in which case you'd need an active VGA adapter.

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