Dell Wireless 1702 Wifi Card not detecting in Inspiron N5110

I opened my laptop to clean its internals as fan is running all the time but they weren't dirty after all.

After I assembled all the parts, Wifi cum Bluetooth Card is not getting detected at all. Neither is it visible in Device Manager. Earlier it used to be shown as 'Dell Wireless 1702 802.11b/g/n card' but its just not there now. Hence I am not able to connect to Wifi or Bluetooth now. It is an Atheros AR5B195. I had recently updated its driver from Dell website to .412 driver to enable 802.11n bandwidth.

I have opened lappy again and checked if wires were fixed properly and they were. Not able to understand what has gone wrong. Kindly help.