Mac Thunderbolt Display Problem

I have a user with the following problem with his home setup.
He is attaching his MacBook Air to a 27" Thunderbolt display.
He is using a Bluetooth touchpad and USB connected keyboard :

"My new display isn't playing nice with my MacBook air.
When I plug it in and close the lid on my MacBook the picture comes up in a much sharper resolution, which it is supposed to do, but at some point thereafter the display picture breaks up and then the screen goes blank. I have to unplug it, open the MacBook lid, and then plug it back in to get a picture back. I don't seem to have the problem if I leave the lid open, but I also don't get the nice resolution either.
 Could this be a video card issue with the MacBook?"

Let me know what you think the problem could be.
Thank you.
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Alan HendersonRetired marine engineerCommented:
It's necessary to follow the instructions below to ensure that your MacBook doesn't sleep when the lid is closed:

This is also useful:

rr4406pakAuthor Commented:
Thanks for the suggestions, but neither of those fixes worked.
It might be a problem with the display cable itself.
We are ordering a new one and we'll see if that does the trick.
rr4406pakAuthor Commented:
The display cable replacement worked. Thanks.

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rr4406pakAuthor Commented:
The fix I tried worked.
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