Intel-based Mac Startup Sequence And Error Codes
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Intel-based Macs such as the iMac, Mac mini, MacBook, MacBook Pro, and Mac Pro rely on a combination of tones and blinking LEDs to prohibitory sign mac display Power On Self Test (POST) error codes. Note that some newer Macintosh mac grey screen of death models only use tones to indicate error conditions. See this article for more information. If the computer detects mac logo makeup no RAM (Random Access Memory) or the RAM installed does not meet the appropriate specifications, the screen will remain black but the power LED on the front of the computer will
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blink once per second to signal the error. This error condition may be due to physically damaged RAM, installing the incorrect type of RAM, or not having RAM installed. Some RAM may appear to pass the Power-On-Self-Test (POST) but still cannot be used by the operating system. In this case, the computer will display a gray screen, sound three tones and blink the macbook error codes power LED on the front of the computer three times, pause, and repeat the blinking until the computer is turned off. The solution to both of these situations is to first re-seat the memory and test the computer again. If the memory fails the POST test again, try memory that has been verified to work correctly on another system (i.e., "known-good") or order new memory from the Apple Store. Last Modified: Mar 16, 2016 Helpful? Yes No Thanks - please tell us how to help you better. Submit Cancel One Moment Please Thanks for your feedback. 34% of people found this helpful. Additional Product Support Information Start a Discussion in Apple Support Communities Ask other users about this article Wait... See all questions on this article See all questions I have asked Still need help? Apple Footer Apple Support Intel-based Mac Power On Self Test RAM error codes More ways to shop: Visit an Apple Store, call 1-800-MY-APPLE, or find a reseller. Copyright © Apple Inc. All rights reserved. Privacy Policy Terms of Use Sales and Refunds Site Map Contact Apple United States (English)
error conditions, and behaviors for all Intel-based Macintosh systems.Note https://support.apple.com/en-us/HT201702 that some newer Macintosh models only use tones to indicate error conditions. See this article for more information. Still having issues? Visit https://natomasunified.org/kb/intel-based-mac-startup-sequence-and-error-codes-symbols/ our help desk for some personal assistance. Help us improve our Support Center. Was this article helpful? Yes No 0 0 Why was this not helpful? Expand Article Show Sidebar Print This Article Updated July 01st, 2015 Category Apple MacBook Air Outside Help Share This Article Knowledge Base ISC FAQ District Website Copyright © 2016 Natomas Unified School District. All Rights Reserved. Powered By:
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