Q: After update to Lion, Wi-Fi does not turn on

when I try to edit form the Vi editor, the terminal says me (permission Denied)

What can I do with this?

When I try to edit them directly with the vi editor, and put the name of the file, it says..permission denied

But if I add the "touch " in the name, it says that i have two files to edit...what do i do here?

2yb, thanks so much for the detailed "neophyte" instructions.  Literally from one moment to the next I had the wifi on my late 2008 macbook disappear.  Since I've never worked in terminal for anything more than minimal commands, this took me a while to figure out.  But once I got all of the commands in the right files AND made sure the root access was correct, the wifi came back right after the 2 reboots. 

For anyone else with the issue, this clearly works -- whatever the core problem is.

Hugely frustratingly, the problem has returned - 2yb's script worked really well for a while. I've deleted all the files from the script and redone it just in case, and it certainly does seem to get the wifi back on if I restart the computer. However, it doesn't stop the problem occurring soon after starting the computer, so that I have to keep restarting it.

Apple people - if you are reading this - surely you can advise on what is going on and how to fix it.

My MBP behaves that way without the script. So that would tell me the script is not doing anything?

I'm in awe that Apple hasn't done anything. Their instant fix for a pulled iOS7 update was praised highly by the pundits.

They must not be writing on MPB's . . . or it wouldn't have been so instant.

There seems to be another, very simple way to restart the wifi engine. Try this:

• Restart your mac.
• Open "Network Preferences". On the left tab, look for wifi connection (usually named Wi-Fi).
• Select the wifi connection, and disable that. To disable a connection, choose gear icon below the tab, and choose "Make Service Inactive".
• After disabled, delete the connection. To delete a connection, choose minus icon below the tab, left of gear icon.
• Now that the original connection has been deleted, we must create a new wifi connection. Choose plus icon, select "Wi-Fi" as interface, and you can name it anything as you want, it doesn't matter thought.
• Apply the change. Once again, restart your mac.
• After system reboot, voila ! your wifi should be working properly by now

Good luck.

I'm having the same problem when updating from Lion to Mavericks. Is the solution still the same as what was described on page 1?

Thanks.

Andy

Hi Andy - have you tried the fix I describe above? It's much simpler and worked for me. I have not tried the solution on page 1. Best of luck.

Hi sag_no.

I'll try your fix when I get home tonight, thanks very much for sharing.

Andy

So I got home last night, rebooted my macbook and wifi was working.  It seems the machine only required a reboot!

Andy