iFixit - Answers With Device "Mac"

MacBook Air 13" Mid 2012: Re-Balled RAM but we still have no boot up

Tue, 14 Apr 2026 17:26:09 -0700

We have a nice 2012 MBA (A1466) (820-3209) that had a 3 beep RAM issue.

We removed the RAM, Cleaned up, No corrosion found, Re-Balled and installed again. Now all we get is an orange / green light on the charger. It appears that all the power rails are intact with no shorts. Q is why isn't it giving us 3 beeps when RAM isn't being detected / failed RAM chip. What are we looking for to check if each RAM chip is functioning or getting power? @oldturkey03 any insight please?

⟐ Commented April 14, 2026 at 17:26 MST

MacBook Pro 16" 2021: 2 New screens tried both showing the same problem

Tue, 14 Apr 2026 09:29:28 -0700

2 new screens fitted both showing colured display which changes to a different colour every couple of seconds. About every 10th screen is like a test page. All screens have a blurred logo

MacBook Pro 13" Function Keys 2017: MacBook Pro A1708 screen problem

Mon, 13 Apr 2026 16:54:29 -0700

My MacBook Pro A1708 after start up shows stripes on picture at the upper section of screen. Progressively you can see more of this from upwards to downwards while the picture becomes clear from upwards to downwards. It takes 8-10 minutes and at the end there is a clear screen without any distortion until next start up. Please help! Any idea?

⟐ Commented April 13, 2026 at 16:54 MST

MacBook Pro 13" Four Thunderbolt Ports 2020: MacBook not turning on but fans full speed

Sun, 05 Apr 2026 13:04:59 -0700

Hello, I got a this machine from a friend who said when he last used it he thought he saw smoke. I have disassembled it and cannot see any visible damage on the logic board. Using a multimeter I have measured that 3 out of the 4 ports manage to power the machine with with 12v stable with disconnected battery. the last port doesn't work I think. When battery is connected voltage is lower but rises slowly, the CPU gets very hot and the fans are off, also the component labeled 2R7 gets really hot. Any help would be appreciated!

iMac Intel 21.5": Replacing my ssd drive

Sun, 05 Apr 2026 10:21:47 -0700

My drive is dead. How easy is it to replace (or is it worth replacing)? If I do replace it, can I restore my system from a backup of the drive or do I need to install a new operating system on the new drive? It is a 21.5 “ 2.7GHz Intel i5.

iMac: I have no sound in chrome on my iMac

Sat, 04 Apr 2026 05:38:11 -0700

I currently have no sound in Chrome on my IMAc at startup

⟐ Commented April 04, 2026 at 5:38 MST

iMac Intel 27" EMC 2546: Help identify the pinout of the PSU (A1419, EMC 2546)?

Thu, 26 Mar 2026 17:18:53 -0700

Hi all, I am trying to do a monitor conversion and hoping to reuse the PSU. The model number is ADP-300AF T. It has 3 connectors, other than the AC input.

One big 12 pin molex connector connected to the logic board.
One small 2 pin connector connected to the power button.
One small 7 pin connector, connected to the logic board via a flat cable.

The big 12 pin molex connector is apparently the 12V rail. It's also confirmed by the schematic.

The 2 pin connector for power button is probably a passthrough to the logic button. The PSU usually needs a PS_ON pin to be pulled to the ground to keep on, if it's like an ATX PSU.

The 7 pin connector probably has that PS_ON pin, along with some other pins. I'm trying to figure out their functions. According to the schematic, they are:

PWR_BTN_R
GND
SMC_ACDC_ID_R
TSNS_ACDC_N
TSNS_ACDC_P
GND
BURSTMODE_EN_R_L

So, it confirms my suspicion about the power button. Pin 1 must be the power button pass-through. I looked up burst mode, which I probably don't need to worry about. But I'm unclear about the rest 3:

SMC_ACDC_ID_R
TSNS_ACDC (Positive and Negative)

Can someone shed some light on them?

P.S. does anyone know what kind of connector it is? I hate cutting the original cable. Worst case, I can solder wires to the PCB but it's kinda hard to do with the connector in place.

Schematic:

Connector:

⟐ Commented March 26, 2026 at 17:18 MST

iMac Intel 27" EMC 2639: iMac late 2013 wont turn on - single LED on

Fri, 20 Mar 2026 05:16:16 -0700

I replaced flash blade SSD with a new PCIe SSD card and all was working fine, but then at some point right before I was ready to seal the screen, the iMac stopped working and I can no longer power it on. I can see diagnostic LED only 1 light is on. From everything I read online power supply if often the problem so I replaced it, but it didn't help. Any thoughts or guidance would be much appreciated. Thank you!

⟐ Commented March 20, 2026 at 5:16 MST

MacBook Pro 13" Touch Bar Late 2016: A1706 2016 MacBook - No power after LCD Replace

Thu, 19 Mar 2026 03:53:35 -0700

Hi freinds,

Hoping to get some insight from someone. I was working on a functioning macbook A1706 2016, with a cracked screen. I replaced the screen and the macbook will not power on.

On amp meter it gets 20v, .75 - 1amp
- cpu begins to warm right away under thermal cam. much sooner than a spare board I have
- PPBUS is 13v
- battery was disconnected during LCD install
- Trackpad click works during power
- Keyboard caps lock worked once, but I could not reproduce it
- I have a tester logicboard, boots up fine with that (rules out any component issues)

Can anyone recommend what I should check next? much appreciate any response

⟐ Edited March 19, 2026 at 3:53 MST

Apple Cinema Display M8149: Screen powers on and button works, but no image

Sun, 08 Mar 2026 23:34:57 -0700

My screen powers on, the power button works controlling the Mac, and the USB ports work, but there is no image on the screen. Before I disassemble this, is it a completely dead unit, or something that may be reapairable?

MacBook Pro 15" Unibody Early 2011: battery not charging from any usb c port

Tue, 24 Feb 2026 02:36:49 -0700

Replaced battery. Macbook Pro A1990 worked while battery lost it's charge. How can I repair?

⟐ Commented February 24, 2026 at 2:36 MST

MacBook Pro 14" Late 2024 M4: Battery Replacement Compatibility for A3401 MacBook Pro Not Available

Sat, 21 Feb 2026 16:13:55 -0700

I have a liquid damaged A3401 M4 Mac Pro, I need to replace the battery. The Battery is not available for this model. Some Resellers note the battery for the 2023 A2992 model will work (Battery Model A2977). Has anyone tried this and can confirm?

⟐ Commented February 21, 2026 at 16:13 MST

MacBook Air 11" Early 2015: Cause of shutdown when sleeping

Sun, 08 Feb 2026 09:04:16 -0700

What would cause this unit to shutdown after around 20 minutes when put to sleep? We haven't changed any battery or sleep mode settings and the battery is a good one. We can close the lid and open it after a few minutes and all is well, but when it is left closed for say 20 minutes the unit is turned off. We tested it with our clean installed SSD and the same happens..... We have reset the SMC, PRAM, run diagnostics & there are no errors being reported, ..... I have been told this was an issue with Monterey & up, but I never encountered this before....I noticed that when it is connected to a charger it didn't shut down after the lid is closed for a longer time. System is on 12.7.6.....baffled.

⟐ Commented February 08, 2026 at 9:04 MST

MacBook Pro 15" Unibody Mid 2010: SIL still not working after HDD cable swap

Sun, 08 Feb 2026 04:09:10 -0700

Hi,

Recently I changed the hard drive cable in my mid 2010 15" MBP (2.66GHz i7) after breaking it. I bought it from iFixit and it included a replacement SIL assembly. After replacing the part the cable works (hard drives boot when installed internally) but the SIL still doesn't work. I've reset the PRAM and SMC.

Does anyone have any ideas?

Thanks in advance

⟐ Commented February 08, 2026 at 4:09 MST

iMac Intel 21.5" EMC 3068: 2017 iMac 21.5 will not power on, led's 1 and 3 illuminated

Fri, 06 Feb 2026 06:59:09 -0700

Looking for diagnosis here . I have an imac from work that will not power on. removed the display, i have LED's 1 and 3 on. Changed the CMOS battery, still no dice. Looking for some guidance!

Have checked the power supply, 12.12 volts on three legs. i hear a slight repetitive clicking from the power supply, so it may be bad?

⟐ Edited February 06, 2026 at 6:59 MST

Mac: My iMac will not starthow to test the mother board and the power supl

Fri, 30 Jan 2026 12:13:20 -0700

i have a 7 funtion multymetter resder

⟐ Commented January 30, 2026 at 12:13 MST

iMac Intel 21.5" EMC 2638: Blade SSD Repair in Fusion Drive and data recovery from HD

Fri, 23 Jan 2026 20:22:00 -0700

I have a problem on my old Late 2013 iMac with 1TB Fusion drive (128gb PCIe x2 Blade SSD + 1TB HD) where the HD is recognize but the SSD is not showing up and because it's a Fusion drive setup the computer won't boot (Just shows ? at boot). I am trying to figure out what my option are for getting the machine back running again. First, I have a Time Machine back but only for up to Oct, 2025 after which the TM drive hot disconnected and never reconnected. So is there a way to recover the missing 2 months of data from the HD drive without the working SSD (serving as a cache drive)? I have a 128GB PCIe x2 SSD from a old 2013 MacBook Air I upgraded that is not being used. Can I use this to somehow restore the Fusion Drive setup and get my missing 2 months of data back? Are there other option for data recovery on the HD? I was able to remove the HD and run Spinrite 6.1 on the drive via a PC and it found no errors with the HD. I can't of course run the SSD without a Mac specific external SSD enclosure due to Apple using a proprietary SSD interface on it's Macs. I going to try and create a bootable external drive with some version of MacOS to see if it detects a internal SSD at all. I should point out that the iMac was running Open Core Legacy Patcher Software on it so I could run a more recent macOS on it then officially supported by Apple (macOS Sonoma) if that makes any difference.

Mac: Mi mac no istala mac osx lion

Fri, 02 Jan 2026 11:38:57 -0700

No puedonistalar mac os x lion

⟐ Commented January 02, 2026 at 11:38 MST

iMac Intel 27" EMC 2390: mini display port replace iMac 27 mid2010

Wed, 31 Dec 2025 04:30:26 -0700

How do I replace the mini display port on my mid-2010 iMac27?and where to find the spare part?

⟐ Commented December 31, 2025 at 4:30 MST

iMac Intel 24" EMC 2134 and 2211: Perché il display rimane scuro?

Tue, 30 Dec 2025 09:59:53 -0700

Perché il display rimane scuro?

Why does the display remain dark?

⟐ Answered December 30, 2025 at 9:59 MST