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Basic MAC Troubleshooting
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Kernal Panic Error
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A kernel panic during startup can have many possible causes, including:
HardwareDevicesCorrupted file or volumeSoftware
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How to Fix Kernal Panic
• Usually you can just restart the machine.
• Reset the PRAM
• Reset PMU
• If these steps don’t work send it down to LRC.
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Other Startup Issues or Symbols
• POST Fails - No Chime at startup– Check Volume– Reset PRAM– Reset PMU– Still no chime - Hardware failure
• Blank Gray screen for more than a minute– Reset PRAM, Safe boot– Software failure or hard drive problem
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Start up problems Continued…
• At startup you see this…
• Can’t find Start up disk
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Startup Continued….
• You may also see this…
• Can't find the root device
• Failed to run fsck (verify disk)
• Can't find the startup disk driver– Hard drive Failure usually
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Startup
• If the Mac displays the gray screen with the Apple logo, and shows a spinning gear, but never progresses past it, then the kernel cannot completely load the operating system. In this situation, you should:
– Continue to wait. The system can perform a disk directory check automatically if it was shut down improperly. On a large hard disk, this might take some time
– If the computer displays the spinning gear and then shuts down, or displays the spinning gear for a long time, this may indicate a long or failed directory check.
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Login Issues
• Check for an Green Dot on Login screen.
• Check for IP address
• Try to login as yourself
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Power Problems
• Check the battery for charge
• Check to see if power adaptor is lighting up amber or green. – Reset PRAM – Reset PMU– Remove the battery and then reinstall
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How to Reset PRAM
• Shut down the computer
• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
• Hold the keys down until the computer restarts and you hear the startup sound for the second time.
• Release the keys.
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How and When to Reset PMU
• When should the SMC or PMU be reset?
You may need to reset your SMC or PMU only if you encounter issues that directly relate to one of these symptoms:
– Fans on high or system throttled when the system is not warm.
– Battery is not charging when it should be.
– LED on portable Mac's power adapter behaves incorrectly.
– Display/keyboard backlight adjustment does not work properly (for example, erratic behavior or no response) in response to ALS (Ambient Light Sensor).
– SIL (Status Indicator LED) behaving incorrectly on Macs that have a SIL.
– Incorrect response to power button press.
– Incorrect response to portable's lid open/close.
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Resetting PMU
• If the computer is on, turn it off.• Disconnect the AC adapter and remove the
computer's battery• Press and hold the power button for 5 seconds and
then release the button.• Reconnect the battery and AC Adapter.• Press the power button to restart the computer
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Questions, Comments Concerns.