Verification: Use Disk Utility and run "verify" to check it. This guide is purely based on my personal experience and is bound to contain errors. I don't claim to be an expert on this subject matter, just an (over)enthusiast Mac user. If your system is having some I/O error then it is sure that there is an HD failure issue. Check the system log using Console.app or running tail -f /var/log/system.log in Terminal.Run Activity Monitor to see that this is NOT due to temporarily high CPU and/or Memory usage.You can do these simple things to check for other possible causes: But after another while, the same thing re-occurs! (This cycle repeats in the current session). You wait for a while, and the system magically comes back to normal. (REASON: The system does not find your HD and thus the OS to boot).Įverything seems to work fine till your system hangs briefly and in an unpredictable way. This repeated every time you tried to boot the system. Apple logo appeared, and wheel spun for about 15-20 seconds, then machine turned off. Not able to boot the system: You tried to boot. Here are some common symptoms that are indicative of some of them: There are many drive/filesystem errors that can occur on a Mac.
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