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2012年6月発売。Core i7プロセッサ 、Turbo Boost / 最大1 GB DDR5 Video RAM

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networks must be manually joined

Since upgrading my 2012 unibody MBP to Mojave, network preferences will not save or automatically join networks. Whenever the computer is restarted or wakes up my wifi network must be manually joined. I have 2 networks which use different routers but the behavior is the same for both. I did not have this problem before upgrading to Mojave. I have tried creating a new wifi network but the problem persists. Any ideas on how to fix this? Thanks.

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Are you still using the original HDD that came with your system or did you upgrade it to either a new HDD or SSD?

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I'm using an SSD.

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Very odd!

First make a full backup of you drive!

If you haven’t already make a USB OS installer following this guide: How to create a bootable macOS Mojave installer drive

You’ll need to run Disk Utility from the OS installer did you get any errors? If you did let us know what you got.

Update (05/27/2019)

Then I think you need to replace your HD SATA cable. As one of the issues with upgrading in this series is the original drive was a SATA II (3.0 Gb/s) drive and the original SATA cable was only rated for SATA II. So when you put in the SATA III (6.0 Gb/s) SSD (which is a good thing!) You forgot to replace the SATA cable with the newer SATA III (6.0 Gb/s) rated version! Here’s the needed cable MacBook Pro 15" Unibody (Mid 2012) Hard Drive Cable and here’s the iFixit guide MacBook Pro 15" Unibody Mid 2012 Hard Drive/IR Sensor Cable Replacement.

There are two additional things you need to do one is placing a stripe of electricians tape on the uppercase when’re the cable crosses over as the rough surface of the aluminum wears the cable. In addition, you want to roll the bends not fold them! Basically I take the ink straw from a Bic ballpoint pen and use it to help be shape the radius of the bend. If you don’t have a pen a bamboo skewer will also work.

MacBook Pro 15" Unibody (Mid 2012) Hard Drive Cable画像

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MacBook Pro 15" Unibody (Mid 2012) Hard Drive Cable

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Thanks for your detailed answer.I should tell you that I recently bought this computer off eBay. It already had the SSD in installed and was running High Serra. The wifi issue occurred after upgrading Mojave. I will still check out the cable. I don’tknow if the previous owner changed the cable when he installed the SSD.

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What likely happened is the person used an external case or SATA to USB adapter to connect the SSD to the system so they could prep and install the OS and migrate any apps & data over.

As the massive data move was done via the external connection it didn't face any problems. Here when you did the upgrade you did the massive data move within the system with the sensitive cable.

Once you replace the cable you'll want to do a clean wipe of the drive and then upgrade via a bootable OS installer USB thumb drive. I would recommend sticking with Sierra How to create a bootable macOS Sierra installer drive. Apple still has issues within Mojave on older SATA based systems like yours with APFS file system (the older HFS+ is still better here) which you can't defeat if you go with Mojave How to create a bootable macOS Mojave installer drive. So unless you have a strong reason, stick with Sierra which is still a great OS!

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Okay, I replaced the cable. Also ran disc first aid from a bootable Mojave installer USB drive and got this error: "directory valence check: directory (oid 0x130053): nchildren(4) does not match drec count (0)". Reinstalled Mojave and ran Onyx. Reran disc first aid from installer USB drive and found no errors. Was able connect back up to wifi automatically after sleep while running off of external USB drive but when I rebooted to internal SSD, wifi would not automatically reconnect . I still plan on doing a clean install but I want to get an ext SSD to back up my data rather than using TM. I like Mojave so I planning on sticking with it. Having to manually reconnect to wifi is an inconvenience but I can live it. Thanks for ally your help!

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Did you replace the HD SATA cable that's the root issue here! While it doesn't seem like it, it is!

This gets into the systems original SATA HD was only SATA II (3.0 Gb/s) and the cable Apple put in was only rated for SATA II, so people often encounter odd problems like yours where settings within the drive don't get written too. As your new drive is SATA III (6.0 Gb/s) now but the cable is unable to sustain the data flow.

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Yes, the HD SATA cable is the one I replaced. Sorry I wasn't more clear.

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fscudder さん、ありがとうございました!
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