2015 iMac goes to new opening like it was brand new
had power failure and added new gateway to home, iMac shows big blank screen
MacBook Air 13″, macOS 15.0
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had power failure and added new gateway to home, iMac shows big blank screen
MacBook Air 13″, macOS 15.0
Try restarting in Safe Mode per the link's instructions and then restarting normally.
2015 iMac goes to new opening like it was brand new