When did sierra come out for mac3/11/2023 Repair the disk by booting from the Recovery HD.How to invoke and interpret the Apple hardware tests - CNET. Use Apple Hardware Test to see if there is any hardware malfunction.Also, see Use safe mode to isolate issues with your Mac - Apple Support and Playing Safe- what does Safe mode do?. Test in safe mode to see if the problem persists, then restart normally. ![]()
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