HT2809 No video from MacPro3,1 (2008) to NIKO SV3706 LCD TV via DVI to HDMI cable.

I connected a DVI to HDMI video cable from my MacPro3,1 (2008) to a NIKO SV3706 LCD TV - and got a blank screen. The TV does NOT indicate "no signal" - as it does on unconnected inputs. (BTW: It works via DVI-VGA.) Any suggestions?

I would say he card is partially failed.
Problem with card ATI Radeon HD 2600 XT for MacPro early 2008
Video Card Problem? -> Mac Pro (2x2.8 GHz Quad) w/ ATI Radeon HD 2600 XT
Replacement Program - ATI Radeon HD 2600 XT video issue

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