Can't connect my 2009 Mac Pro to HDMI with an AMD Radeon HD 7870

That's the basic jist. I recently purchased an early 2009 3.33 GHz Mac Pro running OS X 10.8.5. Installed was an AMD Radeo HD 7870 2048 MB graphics card, which has an hdmi port. I'm able to connect a display via the mini-DVI output, but when connecting through the HDMI input on either my moniter (22" ViewSonic VX2270SMH-LED) or my tv (a 32" LG LED TV) there's no signal. When I plug the hdmi from the computer into one of the tv's two hdmi ports, it recognizes a device and asks to switch over. When I do, it tells me there's no signal.
Again, my specs:
Mac Pro Early 2009
Mac OS X 10.8.5
3.33 GHz Quad-Core Intel Xeon
16 GB 1066 MHZ DDR3 ECC
2 TB SATA Disk
AMD Radeo HD 7870 2048 MB
Help!
Many thanks.

To have your Mac adjust settings automatically, a display must answer with its name and capabilities when the Mac sends a query. The Mac sends such queries:
• at Startup,
• when you click the ( Detect Displays ) button [ try holding down Alt/Option key while viewing System Preferences > Displays] or
• when your Mac awakes from sleep.
So first set your display to the appropriate port. Next try a Restart, or Sleep and wake your Mac, or use the ( Detect Displays ) button.

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Can't connect my 2009 Mac Pro to HDMI with an AMD Radeon HD 7870

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