Model A1013, A1052, A1085, or A1107 / 1440x900 screen resolution

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Power on self test Failed

G4 17 1ghz/1gb M8793LL/A-Powerbook5,1 - A1013 Power PC G4 3.3

In Diagnostics under Power On Self Test: I am getting

Last Run: today

Result : Failed

Failure Type: External Cache

What does this usually mean?

I do not really see a problem anywhere.

Hard drive problem? CPU? ...Something else?

Answered! View the answer I have this problem too

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1 Answer

Chosen Solution

You may notice some small degradation in speed. Sometimes a good internal cleaning will solve the problem. If all else is working OK, I really wouldn't worry to much about it.

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Thank you.

I can probably learn how to do an internal cleaning here on Ifixit.

I also notice that my L3 Cache does not show up in the system profiler.


It used to show 1MB DDR L3...and now not.


Here's how to get to the heat sink, fans and rear vent to clean them out, you may want to reapply thermal paste at this time: PowerBook G4 Aluminum 17" 1-1.67 GHz Heat Sink & Fan Assembly Replacement

Here's the paste I use: Arctic Silver Thermal Paste Here's a generic guide on doing it: How to Apply Thermal Paste


Could the need for a cleaning account for the "failed" test result and the disappearance of the L3 cache readout as stated above?


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