Apple pbg4 ge Servicehandbuch

 

 Troubleshooting

Symptom Charts/Error Beeps - 2

 

4

Select “Mac OS All” in the Extensions Manager control panel 
and restart. 

5

Replace optical drive cable.

6

Replace optical drive.

 

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.

  

    

 

The PowerBook G4 has two memory expansion slots and 

accepts 1.5-inch (or shorter) PC-100 compliant, SO-DIMM 
memory cards; there is no RAM on the logic board itself. Refer to 
Customer-Installable-Parts Memory Replacement instructions 
for removal and installation.

Computer beeps once 
at startup

1

One beep means that no RAM is detected.

 

 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.

3

If a RAM card is NOT installed in the upper expansion slot, 
replace RAM in lower RAM slot with known-good and 
compatible RAM card and restart.
• If symptom repeats, replace logic board.