iMac Intel 27" EMC 2390 Hard Drive Replacement

Featured Guide

Featured Guide

This guide has been found to be exceptionally cool by the iFixit staff.

Replace the hard drive in your iMac Intel 27" EMC 2390.

Upgrade your hard drive for more storage space!

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Edit Step 1 Glass Panel  ¶ 

  • Stick a suction cup near each of the two top corners of the glass panel.

  • To attach the suction cups we sell, first position the suction cup with the movable handle parallel to the face of the glass panel (as highlighted in the second picture).

  • While lightly holding the suction cup against the glass, raise the movable handle until it is parallel with the other handle (as highlighted by the third picture).

  • If your suction cups refuse to stick, try cleaning both the glass panel and the suction cup with a damp soft, lint-free cloth. (Dampen with distilled water, and if needed, an equal ratio of distilled water and white vinegar for best results.)

  • Do not use the suction cups to carry the display glass.

  • The original iMac box makes a good place to store the glass panel.

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Edit Step 2  ¶ 

  • Gently lift the glass panel perpendicular to the face of the LCD enough to clear the steel mounting pins attached along the underside of the top edge of the glass panel.

  • Pull the glass panel away from the lower edge of the iMac and carefully set it aside.

  • During reinstallation, be sure to meticulously clean the inside of the glass panel and the face of the LCD as any dust or fingerprints trapped inside will be annoyingly visible when the machine is turned on.

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Edit Step 3 Display  ¶ 

  • Remove the eight T10 Torx screws securing the LCD to the outer case.

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Edit Step 4  ¶ 

  • Carefully lay the iMac stand-side down on a flat surface.

  • Due to tight tolerances, you will have to use a thin hooked tool to lift the display out of the outer case. As seen in the third picture, we made one out of a bent paperclip.

  • Use a thin hooked tool to lift one side of the top edge of the display by its steel outer frame.

  • After lifting the top edge of the display on one side, hold it out of the outer case while you use a hooked tool to lift the other side.

  • Do not lift the top edge of the display out of the outer case too far, as several short ribbon cables still connect the two components.

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Edit Step 5  ¶ 

  • Using your fingers, carefully pull the vertical sync cable out of its socket on the LED driver board near the top left corner of your iMac.

    • Be sure to pull the connector parallel to the LED driver board, straight out of its socket.

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Edit Step 6  ¶ 

  • Squeeze the two display data cable connector arms together to unlock it from its socket on the logic board.

  • Pull the display data cable connector away from its socket on the logic board.

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Edit Step 7  ¶ 

  • Rotate the display out of the outer case enough to disconnect the LED backlight power cable from the LED driver board. wisdom here.

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Edit Step 8  ¶ 

  • Lift the display for enough clearance to disconnect the LCD thermal sensor cable connector from its socket on the logic board.

  • If your fan is spinning full speed after completion, check this connection or the hard drive's thermal sensor cable.

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Edit Step 9  ¶ 

  • Carefully pull the display toward the top edge of your iMac and lift it out of the outer case.

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Edit Step 10 Hard Drive  ¶ 

  • Before disconnecting the thermal sensor cable, take note of its orientation. It is extremely important to reinstall the connector in the current orientation so the fans will not run at full speed. If you have multiple pins on your replacement hard drive, put the connector closest to the SATA connections and closest to the PCB board.

  • Disconnect the thermal sensor, SATA power, and SATA data cables by pulling their connectors away from the sockets on the hard drive.

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Edit Step 11  ¶ 

  • Remove the two T10 Torx screws securing the upper hard drive bracket to the outer case.

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Edit Step 12  ¶ 

  • Slightly rotate the hard drive away from the outer case.

  • Lift the hard drive off its two lower positioning pins and remove it from the outer case.

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Edit Step 13  ¶ 

  • Remove the two T8 Torx screws securing the upper bracket to the hard drive.

  • Remove the upper bracket from the hard drive.

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Edit Step 14  ¶ 

  • Remove the two T8 Torx pins from the other side of the hard drive.

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Edit Step 15  ¶ 

  • Carefully peel off the piece of EMI foam attached to the front of the hard drive.

  • Don't forget to transfer this to your new hard drive.

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

For more information, check out the iMac Intel 27" EMC 2390 device page.

Required Tools

TR8 Torx Security Screwdriver

$5.95 · 50+ In stock


$6.95 · 50+ In stock

Heavy-Duty Suction Cups (Pair)

$14.95 · 50+ In stock

Related Products

2 TB 3.5" Hard Drive

$119.95 · 7 In stock

Universal Drive Adapter

$29.95 · 50+ In stock

Comments Comments are onturn off

Hey I just replaced my i Mac HDD to a WD Green the previous one was really noisy. Thanks this walkthrough really helped me out. My I Macs now super quiet. This worked well for me. Thanks i fix it.

Levi Oscar, · Reply

Thanks for the guide guys, managed to replace a broken HDD in no time. However, I'd like to mention that standard torx bits could not be used to remove the display, a normal screwdriver with replacable bits is too thick to fit in, and bits are too short, so you will need something thinner (or longer bits).

Thraex Aquator, · Reply

Is it ok to replace the HDD with a SDD? (I know there is a tutorial for adding an SSD as a second drive, but I (and I'm sure others) don't have a big enough need or feel comfortable with the process involved.

Oliver Jobson, · Reply

This is a great guide. If you take your time and don't rush you wont have any problems. I just replaced the HD in my buddy's 27" iMac and had a blast doing it! Step by Step this guide walks you through the process without any questions. Thanks iFixit!

davepascarella, · Reply

This guide was really helpful. I now have a super fast 1TB SSD in place of the original hard disk. It's like having a new computer.

James York, · Reply

I did it! new to this kind but just want a challenge and didn't want to drag my 27" imac into the mall which more than 1 hr away. Everything seems running smoothly except for the fan is on all the time. It's only off when I sleep or shutoff the computer.

Although I read the step carefully over & over again. I noted this issue down because look like it's common mistake. Therefore, I believe after 2nd time re-look and redo, especially on step 8 & 10, I don't know what else can I do to make the fan back to normal again. Any advice please help! thanks

tracythuydo, · Reply

What brand HD did you pull out and what brand HD did you put in?

Scott Dingle,

You can easily lift the glass panel off the magnets with only your fingernails (or something thin like a credit card or a guitar pick). No need to buy suction cups you will only use once.

Nick Caron, · Reply

Yes, you don't need the specific suction cups to remove the display cover - it's held on by magnets, and if you start at the center by the iSight you can work out to the edges and remove it. I had an iPhone screen suction cup around and it helped with balancing the screen when you pull it out fully, but by no ways is it required.

jtowner, · Reply

Great guide and pretty straight forward the only thing that took me ages and I didn't manage to undo were the power btn cable (step 28) and the thermal sensor (step 25) Seemed like they were glued on! Very difficult to remove and obviously conscious so I didn't break anything!

Eddie, · Reply

Thanks!!! Worked excellently.

I used a plunger (clean first ;-) to get the screen off, and for fan control.

Then, i did not take out the whole display and left it in the hinges on the bottom side and held it up with two small cardboard boxes. Easy enough to disconnect the hdd then.

I replaced with an ssd, put that into a ssd enclosure. Had to drill an extra hole in it to fasten the pins that hold it in place.

Used Carbon Copy Cloner to make an image from the old hdd, with the sad connected via usb. Checked it of it booted via System Preferences > Startup Disk. It worked so the took the imac apart and replaced the disk. Booted, everything was working as always, only faster!

Frank303, · Reply

I'm replacing my optical drive too. what exactly needs to be plugged into the SSD? I don't have the kit - as I am not sure one is required if I buy something like this:

Can you please advise? Can I do it with this piece, or do I need to get the entire bracket kit?

Allen Borza,

you should do this mac up, because, for me, one of the suction cup failed, and the glass fall into the lcd screen. Now there is a big hole in it...

Lau, · Reply

This cable is very small and fiddley to remove if you don't have much in the way of finger nails. The cables are very thin and fragile.

James York, · Reply

It took me a bit of work to remove this cable, it was a hassle actually. What worked for me, without any tools, was to use your index and middle fingers' nails and pull it. That worked better than the index and thumb. Took me like 15 minutes, more than what it should take.

thefinalzeta, · Reply

This connection is very fragile, and many people have broken the display connector on the logic board. You need to carefully pull the connector out, and when putting it back together, you need to carefully push the connector back in.

pmah, · Reply

i did break mine. do you know where to buy that component?

Cris, · Reply

You need to squeeze the connector top to unlatch, then pull it parallel to the LED backlight board.

Charlie, · Reply

I just put a 2 TB WD (WD2001FASS) Black in a 27″ iMac. I had issues with the hard drive fan staying on and the system showing the thermal sensor wasn't working. I tried the pin a number of ways but I finally figured out I had to have the connector closest to the SATA connection and the black wire had to be on the board side (toward the LCD).

philomathius, · Reply

Note that the thermal sensor cable is no longer present on the mid-2011 iMac.

Robert Slifka, · Reply

Speaking of the thermal sensor, I just bought 2 2tb internal HDD (Hitachi Deskstar 3.5 and a seagate barracuda green) and both of them have different thermal sensors. Baraccuda is 4 pin, and Hitachi is 2 pin. the pics of the stock western dig looks like it has 6 pins, from a video I saw online of this. I want to trade out my hard rive myself, but I don't want to #$&@ it up, so any suggestions or comments would be greatly appriciated ( I have a 2007 27in 2.66 i5)

William Evans,

I put a 1.5 TB seagate barracuda in (before that there was a 1 TB seagate barracuda). but my fans stay on 4000 rpm. the connector in my machine can only go in one way, so i can't change connections like Philomathius wrote. the connection on the drive is the same: 4 pins, the cable has only 2.

peter, · Reply

This step is somewhat important if you want to use the thermal sensory with a multiple pin style drive. My comment is to just read the instructions a few times before and make sure you use the two pins that are in the top row on the side of the SATA cable.

mike, · Reply

I hate to say this guys, because this guide is really well put together and has been helpful, but I am a little furious at the fact that I bought the recommend Western Digital HDD #WD10EZEX to replace in my mums iMac and the HDD doesn't even have a port to fit the thermal sensor pins in. It just has 8 pins for inserting a jumper. After finishing the process and fitting the new HDD it doesn't even notice that it's there upon boot. I can't see it being an issue with the iMac (however I will now have to take it apart again just to confirm and troubleshoot) but why would you recommend something that doesn't fit the bill?




If this an error on my behalf and anyone could help I would be very grateful, otherwise I'll have to sell the HDD and buy another...

Rhys, · Reply

Hi Rhys,

That HD should work great. If it's not showing up at all then there is another issue in play. Most of the older WD drives had a cutout for the jumper cable. The new ones don't so just remove the extra clip on the iMac's thermal sensor cable.

Scott Dingle,

The best solution for the Thermal Sensor issue is to use a 2N3904 transistor as explained here:


I used that exact solution yesterday and it's working like a charm:

Marc66, · Reply

My 27" 2374 iMac required a torx T9 to replace the hard drive bracket.

etk0770, · Reply

Shout out to a great guide! I managed to put the sensor in step 8 in upside down and the fan did indeed whirl. Got it right the second time and everything is great!

mailericla, · Reply

Many thanks for this excellent guide.

The vertical sync cable took a bit of looking at but it really does just pull out tho had to use pliers to get enough purchase. From there just propped the display up with a DVD case at each end which gave enough clearance to remove the drive. All sweet from there on in. Reinserted the sync cable ok but need to use tweezers to hold some of the case screws in place to overcome the magnets.

Rohan, · Reply

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