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I guess it is because I have logged out it once by accident. and the pi now cannot get any wifi network and just shows "no AP found scanning" I have tried to do the command "sudo ifdown wlan0 && sudo ifup wlan0" and it shows "No wireless interfaces found". I also tried (sudo) iwlist wlan0 scan and it shows "No scan results" both.
Anyone can help?
the result is that there is something wrong on my hardware...
I see what you have tried, and would suggest you use this command:
sudo wicd-curses
It will help you figure out your connections. Point to the one you want and use config to get the password and router IP entered. Make sure you're on the right interface under Prefs. Then try Connect.
As you make changes, use ifconfig to see the results.
Sometimes a reboot is required before they take hold, since curses is changing the configuration files.
After booting up you pi go to the upper right of your display and click on the Wi-Fi icon enter your Wi-Fi info; ie your ssid and password and you will be on your way. If your pi does have Wi-Fi then attach a Wi-Fi dongle before inputting the info.
