External/secondary monitor shows no image/desktop

Hello,
For a year and a half I have been using an AOC E2752Vq 27" as secondary/external display in another room. It's connected to my 2014 27" iMac by a miniDisplay Port to HDMI adapter, then an HDMI to dual Ethernet adapter and back to HDMI.
Everything was working fine until few days ago when without having made any modification (as far as I can remember) the external screen did not show the desktop when I turned it on, neither in mirror nor in extension mode. However it is properly detected by Mac OS and if one of the cable is unplugged the mode switches back to extension and the external display prints out that there is no signal.
I've tried a bunch of things: checking the connections, unpluging/plugging the cables one side, the other side, turning off/on the external screen, reboot the computer, change the display settings in Mac OS's preferences and also a guest account.
When I turn on the external display it only shows the AOC logo, then dark black, then bright black with "Input Not Supported" message.
The only thing I remember doing before it stopped working was to make a security update for 10.8.5
Any idea ?

Hello Somolian,
The article linked below details a number of troubleshooting steps that can help isolate the source of the issue and determine an appropriate resolution.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Cheers,
Allen

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