the laptop charge the battery¿?
what did happen the last time that you used fine your laptop?
Edit: look inside the power jack and watch if is it moved or it's in a strange position. If it is ok, will be a shortcircuit in the motherboard.
Nikolay Savov said "It seems the HDD" and i think so.
If you have a desktop PC, try to connect the laptop's HDD to it, in order to check it is failure.
i gess you are looking for a mini pci express card wifi dual band? it's something like this?http://www.ebay.com/itm/Broadcom-43224-BCM943224HMS-A-B-G-N-300Mbps-Dual-Band-WLAN-Half-Mini-PCIe-Card-/120841658010
Have you performed a clean installation of Windows or have you use a recovery disk? try to perform a Clean Installation of Windows.
Edit: Sorry smorizio, i was writting at same time than you and i didn't see your aswer :(
Sorry :(
What ¡s shown in the "Device Manager", on the CD/DVD-Rom drives section?
you can try reinstall the chipset driver... Sorry, i can see nothing better that could be done