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Introduction

The iMac G3 Uses a 3.5" IDE Hard Drive. It supports data partitions no larger then 128GB and boot partitions no larger then 8GB (The 8GB limit only applies to iMac G3 tray loaders).

  1. iMac G3 Model M4984 Hard Drive Replacement, Logic Board: step 1, image 1 of 1
    • The iMac G3. This was a great computer for the time, and had plenty of features.

  2. iMac G3 Model M4984 Hard Drive Replacement: step 2, image 1 of 1
    • Start by flipping the iMac upside-down. It may help to lay it on a towel, so you don't damage the screen, or scratch the face.

  3. iMac G3 Model M4984 Hard Drive Replacement: step 3, image 1 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 3, image 2 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 3, image 3 of 3
    • Remove this Phillips screw.

    • Using a flathead screwdriver, work your way around the bottom cover, until it comes off.

    • Then, lift the bottom cover up and out, and set it aside.

  4. iMac G3 Model M4984 Hard Drive Replacement: step 4, image 1 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 4, image 2 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 4, image 3 of 3
    • Now, remove the DB-15 Video connector from the logic board.

    • It may be helpful to use a Phillips screwdriver to remove the thumbscrews.

  5. iMac G3 Model M4984 Hard Drive Replacement: step 5, image 1 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 5, image 2 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 5, image 3 of 3
    • Remove the power cable from the logic board assembly.

  6. iMac G3 Model M4984 Hard Drive Replacement: step 6, image 1 of 2 iMac G3 Model M4984 Hard Drive Replacement: step 6, image 2 of 2
    • Remove the front panel connector. (You may also need to remove an additional screw that connects the front panel connector to the logic board assembly).

  7. iMac G3 Model M4984 Hard Drive Replacement: step 7, image 1 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 7, image 2 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 7, image 3 of 3
    • Now, remove these Phillips screws.

    • Now, grab the logic board assembly by the piece of plastic, and lift it out.

  8. iMac G3 Model M4984 Hard Drive Replacement: step 8, image 1 of 1
    • The logic board assembly. This is the heart of the computer, it contains the motherboard, CPU, RAM, V-RAM, PRAM battery, the hard drive, and the optical drive.

  9. iMac G3 Model M4984 Hard Drive Replacement, Optical Drive: step 9, image 1 of 1
    • Now to remove the optical drive!

  10. iMac G3 Model M4984 Hard Drive Replacement: step 10, image 1 of 1
    • The optical drive is located near the front of the assembly.

  11. iMac G3 Model M4984 Hard Drive Replacement: step 11, image 1 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 11, image 2 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 11, image 3 of 3
    • To remove the drive, push it in, lift up, and then pull forward.

    • As you pull the drive forward, disconnect the ribbon cable and set it aside.

  12. iMac G3 Model M4984 Hard Drive Replacement: step 12, image 1 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 12, image 2 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 12, image 3 of 3
    • Remove the two phillips #00 screws.

    • Then remove the board. This will reveal that it is a standard PATA drive.

    • Congrats, the drive is free! You can use any PATA-tray loading drive in the iMac G3 which means you can install a CDRW to burn CDs in OS9 or X(if using OSX,install that DVD writer) but, of course only original drives will match the great look of the iMac).

  13. iMac G3 Model M4984 Hard Drive Replacement, Hard Drive: step 13, image 1 of 1
    • Hard Drive Removal:

  14. iMac G3 Model M4984 Hard Drive Replacement: step 14, image 1 of 2 iMac G3 Model M4984 Hard Drive Replacement: step 14, image 2 of 2
    • Start by removing these Phillips screws:

    • Now, remove all of these cables:

  15. iMac G3 Model M4984 Hard Drive Replacement: step 15, image 1 of 2 iMac G3 Model M4984 Hard Drive Replacement: step 15, image 2 of 2
    • Now, remove the optical drive retention spring.

    • Push in on both sides, and pull towards you releasing the retention spring.

    • It may help to do it one side at a time.

  16. iMac G3 Model M4984 Hard Drive Replacement: step 16, image 1 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 16, image 2 of 3 iMac G3 Model M4984 Hard Drive Replacement: step 16, image 3 of 3
    • Now lift the drive up, and pull it out.

    • Make sure that no cables are snagged before completed pulling out the drive!

  17. iMac G3 Model M4984 Hard Drive Replacement: step 17, image 1 of 1
    • When installing a new drive, make sure that the drive jumper block is set to "Single drive". In most drives, this means removing the jumper, or positioning the jumper horizontally instead of vertically, so you don't lose it.

    • To remove the drive from the metal caddy, remove these four screws from the side of the drive.

Conclusion

To reassemble your device, follow these instructions in reverse order.

39 other people completed this guide.

Chris Green

Member since: 10/11/2009

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4 Comments

great description, great photos

antiquarian1 - Reply

Many thanks. Worked perfectly.

Bob Schowalter - Reply

is the hard disk on a mac interchangeable to iMac 4984 from iMac M5521? Power supply failed on M5521. thx

alexa pritchard - Reply

Çok güzel. Makul bir para ödemesi yapabilirim.

Erdog ̆an Tas ̧cı - Reply

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