How to troubleshoot a Mac that won't boot
Briefly

If your Mac suddenly refuses to boot up properly, try simple tricks like restarting it or using the macOS Recovery console before seeking professional help.
A blank screen could indicate a temporary glitch. Restarting your Mac or accessing the macOS Recovery console can help resolve booting issues.
It's crucial to regularly back up your data on macOS to avoid loss during critical times when your system drive may need replacement.
Older Macs might require a different method to access the macOS Recovery console. Knowing the right method is essential for troubleshooting.
Read at The Verge
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