Debian Configuration :: WiFi Connection Isn't Working After Install?

I just installed the lastest stable Debian (gnome) today and what I was most afraid just happened: my laptop's wifi isn't working properly, it isn't turning on. This had already hapened on livecd.

In the laptop's chassis leds, the wifi led apears as green. When I click to turn on the wifi, as shown on the picture the button, quickly disappears and appears again not seeming to have any effect at all at turning on the wifi but not showing any error either!

Picture :

What's interesting about the wifi not working is that in the installation process I was able to connect to a wifi hotspot and it connected to the internet fine!

Now after installation was complete and my system did the reboot, I was no longer able to connect to the internet using wifi.

My wireless card is Atheros AR9565 and my LAN card is also Atheros.

Here is an output of lspci and lsmod which may have some leads about the problem.

lspci

Code: Select allquant@debian:~$ lspci
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller (rev 06)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)

[Code] ....

Noticed:

1. I installed WiFi radar and I ran this on the terminal:

# sudo ifconfig wlan0 up