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オリジナル投稿者: iith096 ,

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Had the same problem with my mid 2009 Macbook Pro 13 inch running Mountain Lion.  Temporarily (appears to have worked, issue may return in a few days, hopefully not) fixed it by doing this:

1.  Make sure "restart programs" when logging in is NOT checked.  See here: http://macnerd-presents.blogspot.com/2011/08/os-x-lion-wifi-no-hardware-installed.html

2. Rebooted and held down "command + s" to go into single user mode and run /sbin/fsck -fy and if you see "disk modified" at the end, run again until you see "your disk is ok" For more info see here: http://support.apple.com/kb/ts1417

3. Reboot and log in and see if the wifi is showing ok. If not, go into System Preferences and Network and add a new wifi connection using the default naming conventions.  See here for more info: http://www.chriswrites.com/2012/05/how-to-fix-wifi-connection-problems-in-mac-os-x-lion/

Good Luck.

Carlos.

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