Horizantal lines 1-2mm apart fading from left to right....

On my iMac 27" on Friday some greenish lines horizontal lines appear about 1-2mm apart. ON the left side of the green they are visible and fade out to not visible on the right hand side. I've ran tech tool which doesn't detect any problems with anything.
Apple Hardware Tests don't seem to start when i restart holding D, or option D. The latter just says "apple hardware test does not support this machine".
Here's the interesting part. When I take a screen grab and e-mail to another computer/phone, the lines aren't visible. This clearly indicates a screen issue but shouldn't a hardware test pick this up? It's out of apple care however we have a genius appointment booked for tomorrow. I'm just after any help from people who have had similar problems?
I've hoovered in the filters and still no joy.
Any help appreciated!

Here is a photo taken from iPhone so you can see the lines

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