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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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Why is my MacBook running slow after a successful fan replacement?

I replaced my MacBook’s fan after running Diagnostics and receiving a PPF003/PPF004 error message.

I followed the step-by-step iFixit guide and a few videos and installed it successfully.

After the installation, I ran Diagnostics again and received a ADP000 reference code with the message “No issues found”, however, the computer still runs pretty slow. Not as slow as before the fan replacement, but still at a speed that is far from ideal.

Other updates I’ve done over the past two years include upgrading the original HDD to a SSD and replacing the SATA cable. What else could I do to increase performance? Thanks in advance!

Beantwoord! Bekijk het antwoord Dit probleem heb ik ook

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What is the SSD you put in make & model? How much RAM do you have installed? How full is your drive? Cap Vs Used

Did you try backing up your system and then reformatting the drive and installing a fresh copy of the OS?

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Hi, Dan! I put in a Samsung 860 EVO 1 TB. The drive has 882.24 GB available of 999.86 GB. I have 8 GB of RAM installed, 4 GB in each slot.

I have not tried reformatting the drive and installing a fresh copy of the OS. The computer currently has Mojave (Version 10.14.4). The computer loads very slowly at the moment and buffers often, so I’m not sure what’s the best approach.

This all happened suddenly. I hadn’t encountered any issues with performance like this prior to about a week ago.

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Ah! I seen this issue too many times! Your HD SATA cable has degraded! I often encounter this issue when I replace the older models HDD’s with a SSD, as Apple used a SATA II (3.0 Gb/s) rated cable. As a matter of practice I always replace the cable when I upgrade these with better SSD’s. Now the Rub! Apple also had a bad run of cables! So outer insulation would flake off and in the 13” models the cases where’t well machined so they tended to sand off the insulation over time. Your Hard Drive Cable Is A Ticking Time Bomb

So the first step is to replace the cable! MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable and here’s the guide MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement make sure you clean the case surface where the cable sits and place a single strip of electrical tape down (you only need one strip when the larger cable lays). Even still a lot of people damage the cable in the process of putting it in! We don’t want sharp creases where the cable needs to bend around. Folding the cable forcing a tight crease will damage the thin foil wires within it. I use an old BIC pen ink straw (empty) as a forming break to curl the cable around. the radius of the bend should not be smaller than the radius of the straw.

MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable Afbeelding

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MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable

$34.99

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Hi @danj, thank you for the info! How often would you say hard drive cables need to be replaced? I replaced mine almost 2 years ago after upgrading to an SSD around that time.

Are hard drive cables the kind of thing you'd need to replace every few years?

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@ddlc - If you have an older version then yes, its possible it broke down, its also possible the cable became damaged from chafing against the rough case. And lastly someone was a bit rough bending it as I explained damaging the thin foil wires it might have taken a bit more bending to finally cause them to fail. This being a sizable issue when jumping to a fast SSD.

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@danj I highly doubt its a SATA cable. You wouldn't expereince temperature issues, you would just expereince the flashing folder. Wrong info!

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@bezzzles - Nope read what I wrote above! And if you scan the many questions here you'll find people like you that couldn't believe what I told them and once they replaced the cable MAGIC! Everything is better!

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I'm a bit late here but thanks again, @danj! Replacing the cable was the fix that needed to happen.

I was unsure if that was it because I had already replaced the cable once before, but I'm glad to report my computer seems to be operating smoothly again. :)

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You probably need to install something like Mac’s fan control to get it working properly.

Apple is very particular about its fan curve. Sometimes a replacement can ultimately screw up the fan speeds in the OS causing them to run slower as they’re trying not to overheat. The MacOS version should have nothing todo with it you just need to control the fan speeds yourself Via fan speed control app.

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Thanks, @bezzzles! I will look into apps like that. :)

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@ddlc - I would get this one if that is your direction TG Pro but that likely won't fix things.

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@danj If he/she has updated it or patched it to a new MacOS version it can mess up the fan curve of the machine. As it is patched, there is no kext for his current Macbook config meaning the fans run at high fan speeds. It will fix things if you actually knew what you were doing.

Its either the fan replacement or MacOS playing up. SATA cable has nothing todo with it.

Plus, if it is actually the SATA cable there are apps to trick MacOS into thinking everything is ruining at the right Temperature. I think Louis Rossman did one a while back.

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@bezzzles - Fan curve?? Where did you get that idea. The systems firmware/OS won't alter the given systems fan curve. Apple hasn't altered this series SMC fan curve. There is no kext file for macOS straight up, you are thinking when one has BootCamp installed as that is then needed to allow Windows access to SMC. Even still that's not effecting the fan curve. The only thing that effects it is the SMC microcode and external API's via software via TG Pro.

Temp isn't so simple! Yes, CPU and GPU which are under load will heat things up! Thats the basic one, in a laptop the battery and its charging logic also heat things up and then storage HDD or SSD's.

SSD's are a bit odd when they are very full and are the boot drive. They often run into a problem of running out of free space so they need to shift stuff around to move static data to more worn blocks to free up the less worn Wear Leveling To add to this this action causes the SSD to heat up and if you are also accessing the drive by the system you can run into a higher heat event.

But what about the SATA cable?? Whats the deal with it? This is not easy to see or even understand. The best way to put it into perspective is you are trying to have a conversation with someone who is hard of hearing so everything other word is lost in the dialog chain. So the message is garbled so you are asked to repeat and you maybe asked to repeat a have dozen more times. If I where you I would start loosing my patience with so many repeats! Now lets apply this to the SATA cable here we have a data stream and each block of data sent has a CRC value which is then returned to validate the data made it (either way) thats the issue when the CRC doesn't match! So what happens is the data is sent again and again and..... I think you get the picture! Each block goes through this process and only when each block is CRC'd does the next set get sent. This consumes both CPU/RAM resources but also drive resources heating things up! All because the cable is either an old version or damaged!

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Nah Man, Fan curve was a thing introduced in the 2008 Macbook air and got introduced onto the pros in the mid 10's. They needed a way to keep the machine cool with a fan half the mm of the big 2007 MBP. Thats where fan curve software came into play. Although it would still overheat and was still awful, it helped cool down the machine dramatically so the tin-foil of a CPU could actually do something

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