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m.brown · Jul 13, 2005, 04:01 PM

I noticed my PowerBook (15" 1.5 GHz 1GB RAM (512MB each slot) was running slow after I updated to 10.4.2. I checked the system profiler and it only found the 512MB RAM chip in the upper slot. I checked that the RAM was correctly installed (No previous problems since it was installed last year) and reset the Power Management Unit (as per AppleCare instructions).

I restarted the machine and it recognized both RAM slots (total 2*512MB) - Problem solved, or so I thought.

The PowerBook then had a kernal panic. After rebooting only the top RAM slot was recognized, with System Profiler listing the bottom slot as empty. I switched the RAM around, but the bottom slot was not recognized (If you just put RAM in the bottom slot and try to start up you get 3 beeps - meaning the memory didn't pass the startup test).

When I ran the Apple Hardware test it sees the RAM in the lower slot but reports the following error: post/0/208 SODIMM/J25 Lower.

Has anyone seen this before? Is it the logic board - as both RAM chips appear to be fine when running in the upper slot?

kymacman · Jul 13, 2005, 07:15 PM

Originally Posted by m.brown

I noticed my PowerBook (15" 1.5 GHz 1GB RAM (512MB each slot) was running slow after I updated to 10.4.2. I checked the system profiler and it only found the 512MB RAM chip in the upper slot. I checked that the RAM was correctly installed (No previous problems since it was installed last year) and reset the Power Management Unit (as per AppleCare instructions).

I restarted the machine and it recognized both RAM slots (total 2*512MB) - Problem solved, or so I thought.

The PowerBook then had a kernal panic. After rebooting only the top RAM slot was recognized, with System Profiler listing the bottom slot as empty. I switched the RAM around, but the bottom slot was not recognized (If you just put RAM in the bottom slot and try to start up you get 3 beeps - meaning the memory didn't pass the startup test).

When I ran the Apple Hardware test it sees the RAM in the lower slot but reports the following error: post/0/208 SODIMM/J25 Lower.

Has anyone seen this before? Is it the logic board - as both RAM chips appear to be fine when running in the upper slot?

Unfortunately, it seems that the logic boards in the Alum. PB's are failing. See this thread.

http://forums.macnn.com/69/mac-notebooks/262249/powerbook-logic-boards-failing/

Steve