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G5 will now not recognize 2 added dimms that have worked perfectly for 3 years

Added 2 x 500 dimms 3 years ago, has been fine up until recently. But now the computer is running very slow and have discovered it is not showing or recognizing that the extra memory is there. It is showing only the original 2 x 256 dimms and nothing in the other slots. Anyone experienced anything similar?

PowerMac, Mac OS X (10.4.11), computer running very slow

Posted on Jan 23, 2013 6:39 AM

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4 replies

Jan 24, 2013 1:26 PM in response to Neil Cumberland

Take a soft gum type eraser and rub the contacts on the RAM.


Look at this link: Testing RAM @ http://guides.macrumors.com/Testing_RAM Then download & use Memtest & Ramber.


Do you have an Apple Hardware Test disc? Running the Apple Hardware Test in Loop Mode is an excellent troubleshooting step for finding intermittent hardware problems. It is especially useful when troubleshooting intermittent kernel panics. If Loop Mode is supported by the version of the Apple Hardware Test you are using, you run the Extended Test in Loop Mode by pressing Control-L before starting the test. Looping On should appear in the right window. Then click the Extended Test button.The test will run continuously until a problem is found. If a problem is found, the test will cease to loop, indicating the problem it found. If the test fails, be sure to write down the exact message associated with the failure.In some cases, RAM problems did not show up until nearly 40 loops, so give it a good run.


 Cheers, Tom 😉

G5 will now not recognize 2 added dimms that have worked perfectly for 3 years

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