Power-On Self Test
PowerBook (FireWire)
2
Troubleshooting
Power-On Self Test
There is a power-on self test that resides in the ROM of the
PowerBook (FireWire). 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 computer 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 in the Power-On Self Test Beep Definitions chart.
Power-On Self Test Beep Definitions
Beeps Definition
1 beep
No RAM is installed or detected.
2 beeps
EDO memory is installed. The PowerBook (FireWire)
ships with SDRAM SO-DIMMs and does not accept EDO
memory.
3 beeps
No RAM banks passed memory testing.
4 or 5 beeps
Bad checksum for the remainder of the boot ROM. The
ROM (which is located on the microprocessor module)
is bad.
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