My Macbook Pro will no longer connect to my tv via HDMI

Well basically it is in the title, my Macbook Pro will no longer connect to my tv via HDMI.
I have been using this cable for a long time and works perfectly.
earlier today i used it to connect my mac up to my parents 4k tv, it worked fine, did what i wanted to do.
but now when I've come to connect it up to my tv it recognises there is something connected but it won't display anything
it just says no signal on my tv
im not sure whether my mac has changed some settings on its own to run on 4k but now to high to run on my 1080p tv
pretty annoying so any ideas id be very grateful.
I've already tried
restarting my mac
turning tv on and off
different hdmi ports
thank you

Try resetting the SMC and PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM
Try another cable

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THE FIX
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Hi JohnTh
Thanks for your suggestion (and apologies that it's taken forever for me to try this out and get back to you)!
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Launch the Console application in any of the following ways:
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☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
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from the menu bar at the top of the screen. Click the Clear Display icon in the toolbar. Then take one of the actions that you're having trouble with. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
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Please don't post screenshots of log messages—post the text.
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