After turning on my SP3 from sleeping for a couple of hours, I noticed that it had disconnected from the WiFi. After further investigation, I found that the WiFi wasn't even available as an option, and neither was Bluetooth. It's as if the computer doesn't
even have a wireless card anymore. After some googling, I opened the device manager and was going to do the usual "open the driver and reinstall it, then reboot". However, the Marvell AVASTAR wireless adapter, which should be in the list of network adapters,
isn't there at all (even when I check show hidden devices). I've done a "refresh", and then a full reinstall of Windows, and it still isn't working. Is this a hardware failure? What is my course of action provided my warranty is expired?

***Post moved by the moderator to the appropriate forum category.***