![]() Related symptoms include no video or the computer is hung up. They do not depend on the DIAG_LED button being pressed. These LEDs come on if an error occurs or if the BootROM is corrupted. LED CPU B Lower Processor Error LED CPU A Upper Processor Error Use the following table to interpret the LEDs.ĬPU B halts on an IERR (instruction error)ĬPU A halts on an IERR (instruction error) To press the DIAG_LED button, use the nylon probe tool ( Apple part number 922-5065). To read LEDs 1, 2, 7, 8, and 9, you must press the DIAG_LED button, which is adjacent to the LEDs. LEDs 3, 4, 5, and 6 are normally off and will automatically illuminate if an error occurs. The LEDs are located on the logic board between the two DIMM riser card connectors. This subreddit is not endorsed or sponsored by Apple Inc.The Mac Pro (Early 2008) logic board includes a set of LEDs to help service providers troubleshoot the computer. If you'd like to view their content together, click here. This fundamental difference in audience is why we support two communities, r/Apple and r/AppleHelp. Apple SubredditsĬontent which benefits the community (news, rumors, and discussions) is valued over content which benefits only the individual (technical questions, help buying/selling, rants, etc.). ![]() Not sure what to buy?Īsk in our Daily Advice Thread or in our dedicated sister sub /r/AppleWhatShouldIBuy! See also the iPhone Upgrade Wiki for more information.
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