Hi Graeme (not sure why I can’t @mention you, do you have an iFixit username/handle besides your name? Anyway, no solution yet. I saw your post about it as well. Pretty soon I will reach out to iFixit to see if they have any answers, and will post whatever I find!

Thank you for this walkthrough! I successfully completed this for my EMC 2390 (mid-2010 27”) iMac, since I didn’t see a guide for it on iFixit.

After replacing the PSU with an iFixit PSU, the iMac’s display blacks out, then the iMac goes to sleep, randomly through the startup process, or less than a minute while on the login or desktop screen. The only way to keep the iMac up and running consistently is resetting the NVRAM on boot (holding down Command + Option + P + R until you hear four chimes after the first one)…but I have to do it every time I boot or else the iMac display goes black and then goes to sleep as described above.

I’ve tried resetting SMC (unplug for 15 seconds, wait 5 seconds, plug back in), Apple Internet Diagnostics doesn’t work (hold D on startup), so I’ll update this comment if I can find a fix for it.

Thanks again!

Before installing the new battery, the attached cables connecting it to the board need to be bent or kinked in a similar manner to how the old battery’s cables were. I looked at the old battery’s cables for an idea of how to bend the new cables.

Also, I saw how the old battery had some very thin foam attached to the battery (as seen in the photos), and that the replacement iFixit battery didn’t have such foam. I couldn’t figure out a way to remove the foam from the old battery without destroying it, so I went ahead and installed the new battery without it.

Thank you all for this guide! I first cloned my 2014 mini’s internal hard drive (1TB, 5400 RPM HGST) to a Crucial MX500 SSD (same capacity) using Carbon Copy Cloner, then followed these steps. (Just to be safe, I also made a Time Machine backup of my drive in case I had to restore a backup.)

Once I put everything back together and turned on my Mac, there was about 30 seconds of nothing happening on my screen…and then the Apple logo appeared. Boot time was fairly quick after that, maybe 30 seconds—far better than the five minutes it used to be!

Thank you for this guide! I was working on a screen replacement for an HP G7-1260us, but it was built so similarly to the one in your guide that I was able to follow the guide and successfully replace the screen.

Super clear and spot on! Did it in 5-10 minutes, and added a suggested time of 10 minutes to the guide.