Filter
Top Products
PowerBook G4 (1GHz/867MHz) Troubleshooting - 5
Error Beeps Symptom Charts
At startup, a dialog box comes up stating: “kernel panic” in Mac OS X or
“Built-in memory test has detected an error” in Mac OS 9
1. If there are two RAM cards installed in the expansion slots, remove top card and
restart.
• If symptom repeats, replace bottom card with known-good RAM card.
• If symptom does not repeat, replace top RAM card with known-good RAM
card and restart.
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 PowerBook G4 has two memory expansion slots and accepts 1.25-inch
(or shorter) PC-133 compliant, SO-DIMM memory cards; there is no RAM on
the logic board itself. Refer to Memory Card Replacement instructions for
removal and installation.
Computer beeps once at startup
1. One beep means that no RAM is detected.
Note: There is no RAM on the logic board itself, so the computer will beep if no
memory is installed in at least one of the RAM slots.
2. Put the original RAM that came with the computer back in, or put in known-good and
compatible RAM and restart.
• If symptom does not repeat, replace RAM card(s).
• If symptom repeats, replace logic board.
Computer beeps twice at startup
1. Two beeps means that EDO memory is installed in the RAM expansion slot. The
PowerBook does not accept EDO memory.
2. Replace RAM card(s) with known-good and compatible RAM and restart.
• If symptom repeats, 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 upper expansion slot (if not, skip to next step), remove
it and restart.
• If symptom does not repeat, replace RAM card.
• If symptom repeats, replace RAM in lower RAM slot with known-good and
compatible RAM card and restart. If symptom repeats, replace logic board.