How To Fix Common Mac Startup Problems
Overview ď‚—
Mac startup problems can be found by analyzing when in the boot process the system fails.
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Problems may be related to the power supply, battery, hard drive, logic board, OS corruption or an issue with a user account.
Does the System Turn On? ď‚—
If your Mac won’t power on at all, likely suspects are a failed power supply, a bad logic board, a blown fuse (on desktops), a dead battery or a bad AC adapter (on portables).
Does it Make Any Noise?
If your Mac doesn’t make any noise at all when switching it on, or if you hear the fans running but nothing else, you may again have a power supply or logic board failure.
Sometimes a Mac will power on but the hard drive will squeal, whine very loudly or make ticking sounds. This can indicate a failed or failing hard drive.
Startup Tones and Blinking Lights
Bad RAM can be a common culprit – on newer Macs, a blinking sequence of lights at startup can indicate this condition.
If RAM isn’t the issue, check the Apple Knowledge Base for information.
Contact reliable Apple customer support to resolve Mac startup problems instantly
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