Mac Mini Marantz SR6007: Samsung TV keeps blinking

Hello,
I have looked all over for this and I'm on my last rope. I have a mini bought in 2011 which worked flawlessly with my Marantz SR7002 and my Samsung LED TV. The marantz just died and I've just replaced it by an SR6007.
On the mini (and on the mini only, all other machines - Xbox One, Tivo… - work great) I have a phenomenon that others have called "redetection": Samsung TV doing black screen for a second, and coming back showing 1080p@60hz, in a loop (https://forums.plex.tv/index.php/topic/79698-rasplex-cec-and-redetection-problem s/). This link seems to concern a Rasbery Pi with insufficient power, but surely this is not the case for a mini?
I have tried various HDMI cables, I have tried using a powered HDMI hub… No joy.
I have tried to update to Yosemite, resetting PRAM and SMC… No joy.
I have tried my wife's MBP Retina 15" and it works just fine.
I have ordered an HDMI detective but I can't understand why this would be needed since it worked fine without it on the older Marantz?
The "blinking" doesn't appear when the Mac boots (probably because the Graphic card is not immediately active?) but I assume doing a clean install wouldn't help? I'm not looling into replacing the mini (although it could be done)… Any suggestion would be really welcome!
Thanks.
JCV

Try using an app like to get the stranince resolution:
SwitchResX – The Most Versatile Tool For Controlling Screen Resolutions On Your Mac
Display Menu from Mac App Store
The monitor specs
Native resolution1440 x 900
Resolution720p
Supported DTV resolutions576i
Supported computer resolutions640 x 480 (VGA)
PC InterfaceVGA (HD-15)
Video InterfaceComponent, composite, HDMI, S-Video, SCART
From:
http://www.cnet.com/products/samsung-le19r86wd-19-lcd-tv/specs/

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