Skip navigation

PowerMac G5 won't register all ram

842 Views 2 Replies Latest reply: May 4, 2012 3:29 AM by japamac RSS
NaokiS Calculating status...
Currently Being Moderated
May 4, 2012 2:49 AM

Hi all.

 

I recently have been working on a PowerMac G5 which came with Tiger and 5.5GB of DDR2 SDRAM,  but come accross a strange issue which I've read a few people with PowerMac G5 have. At first only 2.5GB of RAM would ever register, but now I can only get 3GB to show. I've cleared the NVRAM and PRAM to no avail, upgraded to 10.5.8 with all updates with no luck. I tried swapping the modules about and found that sticks only register with an identical stick in the same numbered slot on the other group. This is really confusing me, and I'm certain the sticks work, but I can't grasp what's going on.

 

 

Any help would be apprieciated.

Thanks,

Naoki

PowerMac, Mac OS X (10.5.8), PowerMac G5 Dual 2.3GHz
  • japamac Level 7 Level 7 (24,390 points)
    Currently Being Moderated
    May 4, 2012 3:26 AM (in response to NaokiS)

    RAM must be installed in same size pairs from inside out. If you have 4 slots, the pairs are installed 2-1 1-2.

    If you have 8 slots, the pairs are installed 4-3-2-1 1-2-3-4.

     

    http://support.apple.com/kb/HT2248

  • japamac Level 7 Level 7 (24,390 points)
    Currently Being Moderated
    May 4, 2012 3:29 AM (in response to NaokiS)

    Additionally, if RAM is installed correctly and if the RAM is, in fact, guaranteed Mac compatible RAM (not PC value RAM), solder degredation may be the cause. Though typically affecting startup as well, RAM not reading has been reported.

    Heating the logic board around the RAM slots with a hair dryer is a way to test this.

    The area must be heated to hot to touch, then start the machine.

     

    Be sure that RAM in use is Mac compatible.....

Actions

More Like This

  • Retrieving data ...

Bookmarked By (0)

Legend

  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.