External monitor display stopped working

I was on 10.9.2, and from one day to the other, the HDMI connection did not worked any more. My external 27" Samsung remained black. I thought it might come from the HDMI slot on my MacBook Pro Retina (15, early 2013).
I bought a Mini Display port to VGA, did not worked, I tried on other display, don't work, I rest the Pram etc, nothing... I upgrade to 10.9.3. No change.
The display preference Panel does not recognize any thing else than the Retina dsplay... any other display connected is not seen.
I checked the hardwre : diagnostics says everything is alright.
Any idea what the problem is ?
Thanks

According to Apple technician, it's probably a hardware problem... everything else works fine. But for me it is just impossible to work without a larger display.
My MacBook Pro (Retina!) was purchased 1 and a half year ago. The only choice now seems to be to buy a new mainboard. I paid 1500 euro for the laptop, the repairs will cost +/- 1000 euro. Just for a problem connecting an external display.
How can I explain it : it really, really make me furious. More than 20 years along with macs... and so many bad experiences of this kind these last years.
Apple should stop selling computers and stick to smartphones only.
Alright, I will buy next a windows based computer. Oh ! all my professionnal soft are for Mac, I will have to buy them all again...
Traped.
Unsatisfied old customer... who cares ? Nobody.

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