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<blockquote data-quote="immdb" data-source="post: 38147" data-attributes="member: 1238">And Apple says…Power On Self-Test Beep Definition - Part 2Products introduced after October, 1999 use a revised set of power on self-test beeps during startup. This article describes each one.Refer to article 58183: &quot;Power On Self-Test Beep Definition - Part 1&quot; for information on earlier computers.The power on self-test resides in the ROM of the computer. 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).If a fault is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below. If you experience one of these beeps, you may call your Apple Authorized Service Provider for additional troubleshooting assistance.1 beep = no RAM installed2 beeps = incompatible RAM types3 beeps = no good banks4 beeps = no good boot images in the boot ROM (and/or bad sys config block)5 beeps = processor is not usableIn addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.</blockquote>

[QUOTE="immdb, post: 38147, member: 1238"] And Apple says… Power On Self-Test Beep Definition - Part 2 Products introduced after October, 1999 use a revised set of power on self-test beeps during startup. This article describes each one. Refer to article 58183: "Power On Self-Test Beep Definition - Part 1" for information on earlier computers. The power on self-test resides in the ROM of the computer. 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). If a fault is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below. If you experience one of these beeps, you may call your Apple Authorized Service Provider for additional troubleshooting assistance. 1 beep = no RAM installed 2 beeps = incompatible RAM types 3 beeps = no good banks 4 beeps = no good boot images in the boot ROM (and/or bad sys config block) 5 beeps = processor is not usable In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once. Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length. [/QUOTE]

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