Question about Apple iMac G4 Desktop

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IMac I purchased two 256mb modules because I was told by the seller that this would increase memory to a total of 512mb. (I'm starting to have my doubts about this!) I installed the first chip without any problem. The computer started up and ran well.  As was explained by the seller, the second chip was located underneath the processor. I installed the new chip (again a 256mb) and carefully replaced the processor. Now my computer will not compete the start up process. There is an initial starting sound, the orange light comes on, and that's where it stays. The green light on the start button does not appear. Have I damaged the processor in removal? I've double-checked all connections and they are solid. Is there some form of fuse in this system? HELP!

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  • wolfandbunny Aug 24, 2008

    I should have added in my original note that I had removed the 256 module and replaced it with the original that came with the machine, hoping that would at least solve the problem. didn't.

  • wolfandbunny Aug 24, 2008

    O.K., I should have added to the original statement above that I did switch the new 256 module out (located under the processor) and replace it with the original chip that came with the machine.

    There was no change in the start-up problem.


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There is no something like fuses in the board.your chip and processor both are ok dont worry about that.just remove the chips and processor.and get it checked from where you have got the many times this happens when we insert the new chip this problem occurs.for a period of time.and then it disappears.just get it the chips and the processor are not that sensetive to be damaged in simple fixing.check all the standing copper pins.are they proper.thanks.rate the solution.

Posted on Aug 24, 2008

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This sounds like a problem with the second memory chip. Remove it, and see if the machine starts correctly. If so, then put the first chip in under the processor, and try the startup. If it starts, then put the second chip in. If it doesn't start, then I'm going to say that you got a bad chip. It's not that uncommon to get a bad chip straight out of the box. I seem to get about one in every forty, here at my shop.

Posted on Aug 24, 2008

  • Ryan Rogers
    Ryan Rogers Aug 24, 2008

    Can you get to the bios?


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There are no fuses. try removeing the one of the memorys and then both. insert the old memory and see if it starts up.

let me know how it goes.

Posted on Aug 24, 2008

  • 1 more comment 
  • Ekse Aug 24, 2008

    Remove and test, then remove another and test yes without memory at all, put the old back in. should start up. take the old out. put both new in.

  • Ekse Aug 24, 2008

    remove the new chips, start up without any memory, then insert the old memory. see if it starts up.

  • Ekse Aug 24, 2008

    did you take all the memory out and try starting up without any memory? after the startup has failed without any memory insert the old one only.


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