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I was using my WiFi with no problem, but an hour ago I switched it off from system settings and then tried to turn it on again, but no success. It's about 1 month I am using it and I had no problem with WiFi except this one.

I rebooted and went to Windows 7, but even that OS can't turn it on. This is rfkill list all:

0: sony-wifi: Wireless LAN
    Soft blocked: yes
    Hard blocked: yes
1: sony-bluetooth: Bluetooth
    Soft blocked: yes
    Hard blocked: yes
2: phy0: Wireless LAN
    Soft blocked: yes
    Hard blocked: yes
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sudo rfkill unblock all. This command solved it. maybe not useful question! – rastemoh Jun 18 '12 at 15:22
It is a usefull solution! Solver my problems – jarondl Sep 17 '12 at 19:58

You've checked the switch for the wifi if there is one? Also look for a Fn Key combination that will enable it for you.

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there is a key in the front side, but the On and Off states make no change. it also has a LED that turns on when WIFI is enabled, and it's off all the time whether I turn the key on or off. – rastemoh Jun 18 '12 at 15:08

Enter you computer's BIOS and try "Load Setup Defaults" option to re-enable wireless. A few days ago, one of my friends had this problem and we solved it as I described to you.

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