Samsung Monitor not receiving signal through HDMI Mini DisplayPort

I have been having issues using my Macbook Pro on an external monitor lately.
Up until a couple of days ago I was using my monitor as the primary display for my laptop and using the Bluetooth keyboard and trackpad, so my laptop has been closed. I tried to 'wake up' my mac as I usually would do but nothing happened, the monitors power light kept flashing, which is what is does when it isn't receiving a signal, so as anyone else would I investigated and found that my macbook was working the way that it normally would except it doesn't detect the external monitor at all.
I have tried changing the cable, changing the monitor from my 23" samsung display to my 42" sony tv, Restarted my mac more times that I could count and have also updated to the latest software that I possibly could.
I am going to buy a new Mini DisplayPort adapter tomorrow but I would rather just fix it with what I have if I can.
Thank you for any help that can be provided.

Check the cable  does not have an air gap at either end.
Sorry ... no other ideas.

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