6 Replies Latest reply: Jul 1, 2010 12:40 PM by BDAqua
J & F Level 1 Level 1 (5 points)
Have been experiencing strange G5 melt downs lately. It started out with sudden kernel panics whenever Photoshop was handling a larger file, now I cannot get past the grey start up screen, once the process wheel freezes.

AHT came up with the following error code, therefore I assume it is RAM trouble, but how do I identify which slot is defective?

Error code: post/0/248DIMM7/J44

All memory has been installed for years ...

G5 Dual | iMac Intel Core Duo | MacBookPro i7 | MacBookPro Intel | iBook G3, Mac OS X (10.5.8)
  • old comm guy Level 4 Level 4 (2,235 points)
    Search the discussions for "AppleJack" and find a link to download version 1.5. Version 1.5 includes memtest, which is an exhaustive RAM test application which should be run in single-user mode to test the maximum amount of memory.

    J44 suggests the bottom or top RAM slot, if I interpret what my own system profiler output says. (J44 reports empty on mine, which is either the top or bottom slot. (I couldn't find information narrowing it down, though my guess would be the bottom slot.)
  • BDAqua Level 10 Level 10 (120,025 points)
  • J & F Level 1 Level 1 (5 points)
    Not sure if I can get Applejack to run, with the G5 not starting up, but did a little reasearch on the RAM slots:
    turns out the number are marked on the right of each slot, so J44 is the top slot on my machine.

    Next question: do I need to remove both RAMs now (top and bottom slot), since they are supposed to be installed in pairs, before running AHT again?
  • BDAqua Level 10 Level 10 (120,025 points)
    do I need to remove both RAMs now (top and bottom slot), since they are supposed to be installed in pairs, before running AHT again?

    Yes.
  • J & F Level 1 Level 1 (5 points)
    Removing the RAM did the trick - AHT came up without errors!

    Machine is finally starting up again, will see if it runs fine with 2GB less ...
  • BDAqua Level 10 Level 10 (120,025 points)
    Great to hear, with flaky RAM you still might have some bad Data on the HD, I'd do AJ now at least.