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I do NOT have an M1. I have an iMac M3 fully spec. There are NO Lines. It's flawless and works perfectly. I also have AppleCare ONE coverage for this iMac, iPhone and Apple Watch.
Side note you M3 iMac screen is more whiter, brighter or warmer ?? Just like iPhone, whereby both users own the same model of the iPhone but the screen , some look whiter whereas some look warmer.
 
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