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Hi there and welcome
Can you tell me please exactly what happens when it fails to connect to wifi? What error message or issue do you encounter?
Can you open Finder and click Go to folder.
Enter ~/library and press enter
Then delete the below two files
Then restart the Mac and tell me if you can then connect to wifi please.
They are there, there on every Mac, you need to first go to Library, then the folders I indicated
Then you see the files.
You need to first go to ~/library
I think your mis reading my instructions, as the folders and files are there.
I will repeat the steps you have to do
open Finder and click Go to folder.
Then delete the below two files (so first go to the SystemConfiguration folder which is in Preference)
There will be a folder called preference in the library, if there was not your Mac would not load.
ok, your still misreading the instructions.
Remember there are two folders you need to go into, the first is preferences, then you go to SystemConfiguration within that.
Then you delete the files
If your 100% sure its not there (please check carefully as you did not see preferences before when it was there) then its in your Root drive, so in Finder go to /Library/Preferences/SystemConfiguration/
This is Library, not ~/library which is different
Its a Folder, as is SystemConfigurartion, they are folders that store the two files I am trying to get you to trash.
in Finder go to /Library/Preferences/SystemConfiguration/
ok.... but can you do the instructions I gave you please?
The folder is there in one of them, the Mac would not work at all without it... but if you cannot find it will have to try to do this another way.
Click on the Apple icon top left then click on System Preference.
Tell me when you have
Then it will be within ~/library instead, but we will not repeat this as we tried to do this before.
Click on Network.
Then click on your wifi conection and on location at the top click on it and select Edit Locations
Use the (-) to delete the current location, Then restart the mac, go back, click the + and add your wifi connection to the mac and tell me if it now connects.
ok, it means you have connected to a lot of different wifi networks, remove them all please
ok, try to delete as many as you can please
ok, let me know the results please
Power off the mac
Then start the Mac and hold down the Command and R keys at startup.
Hold these keys until the Apple logo appears. After your computer finishes starting up, you should see a desktop with an OS X menu bar and an OS X Utilities window
choose Disk Utility from the Utilities window, or from the Installer menu if you're started from an installation disc.
Click the First Aid tab.
Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
Select your Startup Disk (usually named "Macintosh HD").
Click Repair. Disk Utility checks and repairs the disk.
Let this complete and when it has, tell me if you still have the problem please.
no it wont, but the fact you had that issue could be part of this
yes please, make sure the Mac is completly off first before doing my instructions.
hold the power button until it turns off, this will force it off.
ok, starting to point to a system board failure, explains the wifi issue and the trackpad issue you had before.
Tell me what then happens please.
ok, log in and see if it connects to wifi
ok, try to now do the repair I was getting you to do
ok, let the recovery complete and tell me what then happens please.
You mean you get this error when it ran the repair or when connecting to wifi?
ok, now try to connect to wifi and tell me what happens please.
ok, the fact you cannot even get into the recovery console confirms this is a hardware issue, no matter the software issue we would always be able to get into the recovery console. As you indicated the issue with the trackpad, then it points to the system board as whats failing and this will need to be replaced. I believe additional issues will occur in the near future, or you get a total failure and it stops starting.
I am really sorry about this and you are going to have to return the Mac to have this replaced. It will be covered by the warranty if this has not expired, and the replacement will be done at no cost to you.
I am really sorry about this, and if you have problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service, that would be greatly appreciated.
If you need anything else, please let me know, and please remember the service rating.