How can I fix ghosting images on my iMac (27-inch, Late 2012)?

How can I fix ghosting images on my iMac (27-inch, Late 2012) ?

The only way to fix it as of now it is setting the fan to max speed at all times.

Is the ghosting issue caused by the graphics card or by the screen? If I replace the graphics card, should it work fine? Is there any firmware update as well?

Thank you.

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What do you mean by ghosting?

Can you take a small vid with your phone so we can see what your issue is. Ajout d'images à une question existante

Also you appear to be using some software override for the fan who's are you using and did you alter your iMac (swap out the HD or add in a SSD)?

Also what are you doing here? CAD, Picture or Video editing.

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