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Released June 2012 / Core i7 processor with Turbo Boost / Up to 1 GB GDDR5 Video RAM

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Too Slow and Doesn't Wake Up

It’s been a couple of years and I’m not a techie so bear with me. My battery was dying so I replaced the battery. I also ordered a SSD to replace my HD but I didn’t replace the SATA cables, and I expanded my RAM to 16 GB.

My system specs are:

  • processor: 2.3 GHz Intel Core i7
  • memory: 16 GB 1600 MHz DDR3
  • graphics: Intel HD Graphics 4000 1536 MB
  • Trim support = yes

Battery says:

  •   Charge Information:
  •   Charge Remaining (mAh): 3836
  •   Fully Charged: No
  •   Charging: No
  •   Full Charge Capacity (mAh): 5252
  •   Health Information:
  •   Cycle Count: 81
  •   Condition: Service Battery
  •   Battery Installed: Yes

AC Charger Information:

  •   Connected: No (plugged in)
  •   Charging: No  (battery icon shows it’s charging)

My battery has never said it was fully charged even when it showed 100%. I followed the video tutorials on how to install a battery and condition it and how to install an SSD and boot up with a bootable USB. The videos also showed how screaming fast their “new" mid-2012s were with a timer. I didn’t get to enjoy any of this. I was wondering if I needed to replace the SATA cables.

Also, I had made the mistake of installing the 64-bit OS, then realized nothing worked with it and my Excel spreadsheets were literally backwards. I then erased everything again, re-initialized (again following a tutorial) and loaded Mountain Lion OS and upgraded to Mojave, which is where I’m staying put.

So these are my problems.  My Mac is very slow and won’t hold a charge for very long even with the “new" battery.  My last battery lasted 9 years.  When it’s charged up, I take it off of the charger, use it then close it.  When I go back to use it, I have to reboot sometimes several times a day with it plugged in and the battery is at 95%.  Sometimes it’s reliable.  Right now it’s being a pain.  I’m not sure if this is a hardware issue, or if I have legacy files from the 64 bit system when I restored my files and need the “genius” bar.  I did see another question regarding the same battery issues I’m having and the responder suggested the coconut battery app.   I can’t get it to download and half the time I can’t get access to the App store.

Update (03/01/2021)

@bmx2019 I believe the fan is running because my laptop is always in my lap and it doesn’t get overly hot.

@dan I tried holding down the D at restart and received an error message about a missing file. I also tried option D at restart and recieved the same error message ‘Cannot load EFI/Drivers/Test/Support.efi. I read through Apple Support looking to see if the .diagnostics folder was in the right place but wasn’t able to find it.

EDIT: According to the Apple Forums it appears the Boot ROM was changed when upgrading to Mojave and option D is no longer available. Downgrading does not change the firmware.

@gizmowizards I did adjust the SMC following online instructions. I've been poking at this problem for over a year now. I haven't adjusted the energy saver settings. On battery and power adapter they’re set at 15 minutes.

Update (03/02/2021)

I can’t seem to upload my screenshots using the media manager. I add my screenshots, press “Upload Media” it takes me to a new screen. The new screen has a “Back” button and an area to upload media or a URL. When I drag and drop my screenshots into that screen it takes me back to my original screen and the circle continues. What am I doing wrong?

Update (03/02/2021)

@danj The only way I could load the images was to use a PC (smh). The battery was purchased 7/19, probably installed 8/19:

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Beantwoord deze vraag Dit probleem heb ik ook

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Is the fan spinning? Look at MacBook Pro 15" Unibody Mid 2012 disassembly page. Check all fan connections? A non-working fan will slow down mac.

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Lets run the onboard diagnostics to see what it tells us. Restart your system and press the D key.let us know what the errors are.

Reference: Mac startup key combinations.

Let’s get a better view of things with your battery and charger, install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Voeg afbeeldingen toe aan een bestaande vraag. Make sure the MagSafe charger is plugged in.

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@dan I can't get coconut battery to download from the app store. I've tried to download both Battery Health and Battery Health 2 with no success.

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@paintslinger88 - Its not in the Apple App Store! Click on the Blue URL link I posted in my comment above.

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I would start by checking the CPU temp you may need to replace thermal paste, and also rather than installing Mountain Lion and upgrading I would install straight to MacOS Catalina. Will save time and is always better to start with a sound foundation.

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When the system info window says service battery that means you need a new battery. If you recently replaced the battery then there is a high likelihood that is a bad battery. Replace the battery and reset the SMC. If the computer still does not wake up adjust the energy saver settings.

Update (03/01/2021)

High likelihood that the battery is the culprit. We run into bad MacBook batteries all the time try and purchase a battery from iFixit they have a really good return policy if the part is faulty.

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@gizmowizards - Agreed! Likely a worn-out battery based on the age alone. That doesn't explain the slowness.

I'm suspecting there's a second issue here so the system is in CPU Safe mode where SMC is trying to make sure the system doesn't over heat lowering the CPU's clocking and ramping up the fans. Which is why I focused on the onboard diagnostics to hopefully ID what sensor is firing off or if it was damaged.

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Slowness may be attributed to throttling or just an old OS as well, hard to say until a known good battery is installed.

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@danj I'm not able to run the diagnostics. I came across a reference to the library where the .diagnostics (file or folder?) was supposed to be located but I cannot find the thread that mentioned it. I had done a search on my mac for .diagnostics with no results.

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@gizmowizards I contacted iFixit today with the screen shot from the Apple Forum from 12/19 when I posted my battery wasn't showing fully charged even though it was at 100%. Since I'm outside of the one year warranty, they are going to give me a 50% discount on a new battery. How do I go about following your advice about CPU Safe mode and SMC?

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@paintslinger88 - Here’s an example on posting an image from the image manager.

Here’s my media manager window

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and if I click on the first image this will get posted here

Block Image

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@danj When I click on my image, nothing happens. I have the little point finger, click, and still have the pointy finger with no message or action. I even have a hard time editing my post in this forum. So I’m thinking there might be a compatibility problem. I'm running iOS 10.14.6, I meet the requirement. I’m trying to post .png files and those are accepted file formats. What am I missing? I also can’t exit out of Media Manager to get back to my thread. I've read the link you included earlier and I'm not doing anything different. I also tried attaching files while in Google Chrome. I've tried both private and regular browsing.

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paintslinger88 zal eeuwig dankbaar zijn.
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