Results 1 to 5 of 5
  1. #1


    Member Since
    Jul 08, 2012
    Posts
    3
    Specs:
    iMac 2.5Ghz, iPad 2, Powerbook G4 Alum.
    Powerbook G4 hardware issues
    Hi all. I have a 12" Aluminum Powerbook G4 1.5 GHz, 512 MB RAM, that has two issues currrently keeping it out of working order, and I'd like to be able to get it working again for a family member who doesn't need a newer computer.

    1) The screen is completely dark, but you can still make out screen images and print in light, especially sunlight. From what I have read online, this is a problem with something called an inverter, with which I am not familiar.

    2) Whenever I boot up, even if I try to boot up from the install disks, I get an "invalid memory access" message.

    I have a new memory module on the way to make it smoother, so I'll be able to try it out with that soon, but I also don't believe it's the replaceable memory that's the problem, because when I remove it, I still get the invalid memory access message. From what I've read on this issue, it seems this can be due to problems with on-board memory, video memory, or the logic board. Unfortunately the issue is not covered in sufficient detail in any thread I've found so far. I guess what I'm looking for is more of a detailed walkthrough to determine what the problem is and what I can do to fix it.

    Thanks,
    Netherfox

  2. #2


    Member Since
    Jul 08, 2012
    Posts
    3
    Specs:
    iMac 2.5Ghz, iPad 2, Powerbook G4 Alum.
    I should mention too that my system clock appears to be set to the year 1904.

  3. #3

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    35,143
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Quote Originally Posted by Netherfox View Post
    I should mention too that my system clock appears to be set to the year 1904.
    Need new PRAM battery for that.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  4. #4


    Member Since
    Apr 24, 2009
    Location
    UK
    Posts
    746
    Specs:
    MacBook Pro 15" 2.8 GHz
    Your Powerbook has some serious problems. Sounds as if you have an inverter problem. The inverter board is a long rectangular PCB under the clutch cover in the display assembly. This Powerbook isn't as easy to work on as the 15" and 17".

    If the date and time doesn't stick after entering, it won't be the PRAM battery, as this Powerbook has similarities to the iBooks, no PRAM battery. They use a very high value capacitor soldered to the logic board that will hold a charge just long enough to save settings while you change a battery. If your main battery is shot or not fitted you will lose date and time when disconnecting the power adapter. See Portable Computers: Models Which Do Not Have a Backup Battery.

    Your error message sounds as if the have a defective logic board.
    Steve
    UK

  5. #5


    Member Since
    Jul 08, 2012
    Posts
    3
    Specs:
    iMac 2.5Ghz, iPad 2, Powerbook G4 Alum.
    Thanks for the responses. I received my additional 1GB stick of RAM and added it, I'm still getting the same message so it's not that. Process of elimination I suppose.

    I was thinking about it. I think the time got reset when I tried to reset the PMU a couple of weeks ago. I had forgotten I tried that so maybe there's nothing to it other than that.

    With that in mind, is this still likely a logic board issue?

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. EMac Hardware Issues
    By Jhommes in forum Apple Desktops
    Replies: 6
    Last Post: 07-09-2011, 11:32 PM
  2. powerbook 5,6 hardware problems
    By Incentive2010 in forum Apple Notebooks
    Replies: 2
    Last Post: 02-14-2010, 03:17 PM
  3. iPhone hardware issues
    By MacDad77 in forum iPhone Hardware and Accessories
    Replies: 3
    Last Post: 07-11-2008, 02:02 AM
  4. Known hardware issues
    By aan in forum Apple Notebooks
    Replies: 1
    Last Post: 03-11-2008, 01:20 PM
  5. Bootcamp hardware Issues
    By precisionelite in forum Running Windows (or anything else) on your Mac
    Replies: 7
    Last Post: 01-14-2007, 02:26 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •