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Radeon 5770 HDMI output doesn't work

Radeon 5770 HDMI output doesn't work
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My machine is fitted with a Radeon 5770 video card. I normally connect to my monitor via the dvi output with no problems. However when I noticed that both the monitor and the video card have HDMI ports I tried connecting with a HDMI cable. The result was a "No Signal" error on the monitor and no video as a result.
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