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Hi
my late 2012 iMAC 27 as it boots up I get the screen covered in multi coloured bars and after boot up the screen flickers
I is 100% ok when running on an external monitor
I this a failed graphics card or the screen itself
PS where is the graphics card I have the screen panel off and can’t see anything obvious
Thanks
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Sadly this sounds like you have a bad display assembly. This can happen when the wrong tools are used to remove the display. Here’s the proper tool you need: iMac Opening Wheel and i recommend getting two sets of these Plastic Cards. As you’ll need new adhesive strips you might as well get the kit [produit lié absent ou désactivé : IF174-005] which comes with the cutter wheel. And lastly here’s the needed part: 27” iMac Display Assembly (used) Apple P/N 661-7169 The new ones do seem to be in short supply.
Here’s the guide to put it in Remplacement de l'écran de l'iMac Intel 27" EMC 2546
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Hi
This iMAC has never been opened until I did it yesterday
I bought the recommended tools on line
I don’t agree with you on this one
par allistair gordon
Post a picture of your screen so we can see the damage Ajout d'images à une question existante
par Dan