This error condition may be due to physically damaged RAM, installing the incorrect type of RAM, or not having RAM installed. If the computer detects 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 blink once per second to signal the error. Note that some newer Macintosh models only use tones to indicate error conditions. 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 display Power On Self Test (POST) error codes. Mac Pro, Mac mini, MacBook, MacBook Air, MacBook Pro, iMac Learn about Intel-based Mac Power On Self Test (POST) RAM error codes. Intel-based Mac Power On Self Test RAM error codes Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length. The LED will repeat the sequence after approximately a 5-second pause. In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. If you experience one of these beeps, you may call your Apple Authorized Service Provider for additional troubleshooting assistance.Ĥ beeps = no good boot images in the boot ROM (and/or bad sys config block) Instead, the system will beep as explained below. If a fault is detected during the test, you will not hear a normal startup chime. This test runs whenever the computer is turned on after being fully shut down (the power-on self-test does not run if the computer is only restarted). The power on self-test resides in the ROM of the computer. Power On Self-Test Beep Definition - Part 2
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