Basic MAC Troubleshooting

Kernal Panic Error A kernel panic during startup can have many possible causes, including: Hardware Devices Corrupted file or volume Software

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.

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

Start up problems Continued… At startup you see this… Can’t find Start up disk

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

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.

Login Issues Check for an Green Dot on Login screen. Check for IP address Try to login as yourself

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

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.

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.

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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