White horizontal line
Since updating my iMac to the latest software update. My iMac has started showing a white horizontal line on the top of my Lock Screen. Has anyone else had this issue and knows of a way to fix it?
iMac Line (2012 and Later)
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Please try resetting the NVRAM per the instruction in NVRAM Reset. If that does not work, please restart in Safe Mode per Safe Mode Reset instructions.
If the problem persists, please let us know and we can ask you to post an EtreCheck report of your system to look for obvious issues.