Run Apple Service Error Diagnostic Run Apple Service Diagnostic version 3S135 to determine if any thermal sensors or blowers are malfunctioning. If ASD is not available, run Apple Hardware Test version 3A189 by holding down the D key during startup. When a test reports an error, reseat appropriate connections. If issue persists, replace the corresponding part (sensor, blower, logic board, video card, or power supply). See Apple Hardware Error code chart below for correlation between error code, affected sensor, sensor location, and additional checks to perform. AHT Error code Suspected part and Location Suggested Action Notes 4SNS/1/C0000008: TA0P - xxx mbient temp sensor damaged or disconnected from logic board. Verify sensor cable is securely connected to the top edge of the logic board and attached to the left speaker housing. Replace sensor cable if damaged. All fans ramp at full speed if sensor is disconnected. 4SNS/1/C0000008: T00p-xxx ODD temp sensor dama
Access Terminal via Recovery Mode for Mac Some more advanced Mac troubleshooting and diagnostics techniques require a user to access the Terminal from Mac OS Recovery Mode. We’ll show you how to quickly access the command line while a Mac is booted into Recovery Mode. For some quick background, on a normally booted Mac, the Terminal application is found within the /Applications/Utilities/ folder, and it can be accessed directly through the folder hierarchy or by using Spotlight to search for and launch Terminal app. But Recovery Mode does not have the same applications directory access, nor does it have Spotlight or Launchpad. Nonetheless, accessing Terminal from Recovery boot mode is easy. Accessing the Command Line in Recovery Mode on a Mac Boot into Mac OS Recovery Mode as usual by holding down the Command and R keys during system start Choose the language as usual (if applicable) At the “MacOS Utilities” screen, pull down the “Utilities” menu from the top of the