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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How do I install memory on my 2010 iMac?

This is a basic 'DIY' answer.

Assuming your iMac is plugged into a properly grounded outlet ...

  • Large, soft towel or such.
  • a Phillips screwdriver (size 1 or 2).
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  1. Shut down the iMac completely.
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This model iMac has 4 memory slots. You likely have two memory slots filled and two that are empty. So this describes how to add two more memory modules to the two that you already have.

Note that there is a notch in the edge of the memory module that needs to match up with the 'bump' of the available memory slot inside the computer.

  1. Gently, but firmly slide the memory into the slot, making sure that the notch/bump line up.
  2. When the memory stops sliding easily, use one hand to hold the iMac steady and use the other hand to firmly push the memory securely into the slot.
  3. The memory should 'click' into place and be even with the other memory, if already installed.
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  5. Slide it back out and make sure the notch in the memory lines up with the bump inside the computer and try again.
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IF it beeps three times, then there is something wrong ... UNPLUG the power cord!

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Selection criteria for a new capacitor are: same capacitance (Greek letter mu and F, looks somewhat like uF), same or higher voltage rating, same or higher maximum temperature rating, highest available endurance at rated temperature, and highest available ripple current rating. A capacitor with too low a ripple current rating will probably burn out prematurely. Also, select for low ESR (Equivalent Series Resistance) or low impedance if you have two parts that are otherwise equivalent on the specs. Oh, and be sure you check the physical size - diameter and height in millimeters. It's embarrassing and costly to order a part, then find it won't fit the space on the circuit board, or it's too tall to put the cover back on over it. Replacing parts on a multi-layer logic circuit board is not a task for beginners. Power supplies are usually single layer and somewhat easier to work on.

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