Apple G4 manual Power-On Self Test

Troubleshooting General/ Power-On Self Test - 5

Power-On Self Test

There is a power-on self test that resides in the ROM of the Power Mac G4. This test automatically runs whenever the computer is powered on after being fully shut down (the power-on self test does not run if the machine is only restarted). If a problem is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below.

Power Mac G4 (all models except PCI Graphics):

•1 Beep: No RAM is installed or detected.

•2 Beeps: Incompatible RAM types are installed (for example, both SDRAM and EDO installed).

•3 Beeps: No RAM banks passed memory testing.

•4 Beeps: No good boot images are detected in the boot ROM (and/or there is a bad sys config block).

•5 Beeps: The processor is not usable.