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WebDevRobert / June 3, 2009

Macintosh POST Beeps Defined – Part 1

What do the beeps during the Power-On Self-Test (POST) mean?

When a fault is detected during the Power-On Self-Test, you will not hear the normal startup chime. Instead, the system will beep as explained below.

1 beep = No RAM installed/detected
2 beeps = Incompatible RAM type installed (for example, EDO)
3 beeps = No RAM banks passed memory testing
4 beeps = Bad checksum for the remainder of the boot ROM
5 beeps = Bad checksum for the ROM boot block

Of course if you experience one of these beeps, Apple wants you to call your Apple-authorized service provider for additional assistance.

The power-on self-test resides in the ROM of the computer. Only computers that are based on the ROM-in-RAM (New World) technology, such as the iMac, Power Macintosh G3 (Blue and White), Power Mac G4 (PCI Graphics), PowerBook (FireWire) and PowerBook G3 Series (Bronze keyboard) will generate these beeps. This test runs whenever the computer is powered on after being fully shut down (the power-on self-test does not run if the computer is only restarted).

The information in this article came from Power-On Self-Test Beep Definition – Part 1!

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Filed Under: Technology Tagged With: Apple, Guides, Imported Post Archive, Macintosh

God gifted me an aptitude for creativity and technology. I am currently using those gifts to deploy web servers and websites.

I believe the combination of those gifts and a little Godly inspiration lead to the creation of the GLEEMPLE Deployment Process.

Most of the technology articles I write are a result of working with web servers and websites deployed using the GLEEMPLE Deployment Process.

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