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PowerBook G4 (12-inch) Troubleshooting -
3
Symptom Charts
Error Beeps
The computer automatically performs a power-on self test when it is turned on after being
fully shut down (not a restart). This section describes what to do if beeps are heard during
the startup.
Note:
The computer has a memory expansion slot that accepts a 1.25-inch (or shorter)
PC-2100 compliant, SO-DIMM memory card. Refer to the Memory Replacement
instructions for removal and installation.
Computer beeps once at startup
1. One beep means that no RAM is detected.
2. If a RAM card is installed in the expansion slot, remove it and put in known-good and
compatible RAM and restart.
• If symptom does NOT repeat, replace RAM card.
• If symptom repeats, replace logic board.
3. If no RAM card is installed, replace logic board.
Computer beeps three times at startup
1. Three beeps means that no RAM banks passed memory testing.
2. If a RAM card is installed in the expansion slot, remove it and put in known-good and
compatible RAM and restart.
• If symptom does NOT repeat, replace RAM card.
• If symptom repeats, replace logic board.
3. If no RAM card is installed, replace logic board.
Computer beeps four times at startup
1. Four beeps indicates a bad checksum for the remainder of the boot ROM. The ROM
(which is located on the logic board) is bad.
2. If a RAM card is installed in the expansion slot, remove it and put in known-good and
compatible RAM and restart.
• If symptom does NOT repeat, replace RAM card.
• If symptom repeats, replace logic board.
3. If no RAM card is installed, replace logic board.
Related article:
58442: Power On Self-Test Beep Definition - Part 2