Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7

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disco pixels and screen twitching after replacing HD for SSD

Today I replaced in my iMac EMC 2390 my 3.5 HD for a samsung 850 EVO SSD. Now I have some white pixels turning on and off almost like snow, random. And some now and then there is a partial screen twitch horizontal.

What did I do wrong, I follow the guild to the letter.

Who can give me some advise?

Kinds regards

Vincent

Answered! View the answer I have this problem too

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Thank you so much! Should have thought of it myself :)

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I would double check the display cables.

Did you damage one (or the connector on the logic board) or not fully insert it?

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Vincent Blokker will be eternally grateful.
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