2011 mini-thunderbolt port to monitor not working

I have a 2011 i5 Mini which I am using as a media server - hdmi port to my tv and the Thunderbolt port to my 1920x1080 monitor. The problem is with the Thunderbolt port.
I understood that I could use a Mini Displayport (MDP) adapter and go to the monitor either as VGA or DVI. Hooked up the MDP-VGA adapter and all was good for the last couple of weeks: both the monitor and the TV works and the monitor also worked fine with the TV off.
However, today, the monitor wouldn't show a signal. Figuring it was the cheap monitor, it pulled it and hooked it to a 2010 mini and it worked correctly with dvi and vga. Put it back on the 2011 Mini and tried a MDP-DVI adapter, but no joy. Image came on the monitor for perhaps 2 seconds and then disolved to just white noise. Re-booted with same result.
Pulled the HDMI cable that was going to the TV and used the supplied HDMI to DVI adapter to the monitor and it now works, but now I can't use the TV.
I am assuming that this is a trip to the Apple store for warranty work unless anyone has an idea to try. BTW, the 2011 MIni is fully up to date according to Software Update.
Thanks, all.
Peter

Solved the problem with a new dvi to mini-display port cable from amazon. My 2 adapters must be bad.
Peter

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