MBA 2012 - Mavericks; WiFi will not scan

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I have experienced this problem through the developer previews through to the currnet release.
When se;ecting Wifi form the menu bar, I get a drop down liat as expected.
Occasionally it will scan for networks once, most of the time it doesnt. If i keep the list down with networks it can see it does not rescan as it should do.
If I choose 'Join other networks' and show networks the box is empty and it still does not scan.
Any ideas?
I've carried out fresh install from scratch, still have the prob
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Replay

williain wrote:
Personally, I've had success using the configuration generated by wifi-menu, but modifying it to use a static IP address.  After wifi-menu failed, IIRC I used 'netctl start [profile]' to start the generated profile and observe the errors which suggested it was having trouble using DHCP to get an IP address (or I may have had to use 'netctl status [profile]' to see them, I forget), then just tweaked the file using vi and got it to work (hurrah for the Arch way!)
Now I use systemd to bring it up at boot, as I mostly use that machine without a display connected, and ssh in to it.  Touch wood, that's always worked for me (except when the router has crashed, then I need to hook up the display and manually connect, but thankfully that's relatively rare)
That is a good use case for systemd: headless. Wifi-menu has been really good for me, however once in a while, I have had to delete the netctl entry and rerun wifi-menu to make a working one. Note sure why.
In the case where your headless box will not connect to the network, I would like to play with using a serial connection to the headless box. I guess it would be an USB to serial connection. On the R Pi and BBB, I used a funny little USB to serial pigtail like thing, with 'screen" I think it was.  Worked really well I thought.