How do I make Debian 9 detect network hardware?

Question

While programming, without big deals, the wifi stoped working. I tryed to unload and load the b43 drivers my wifi uses, but didn't work, tired, I decided to do a fresh install of debian 9.4. I did so, I did re-install b43 and enable it, but I just realize the problem is no network adapter is recognise. The result of lspci is as follows:

00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b) 
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b) 
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 0b)
00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04) 
00:16.0 Communication controller: Intel Corporation 8 Series HECI 0 (rev 04) 
00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04) 
00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 3 (rev e4) 
00:1c.4 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 5 (rev e4) 
00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04) 
00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04) 
00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)
01:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTL8411B PCI Express Card Reader (rev 01) 
01:00.1 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 12) 
02:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 840M] (rev a2)

The laptop stopped working suddenly so I don't believe it's due to hardware problems. How can I make debian detect my wi-fi card?

Answer 1

Does the laptop have a physical RF-killswitch? Typically such a switch would disable the WiFi and bluetooth transmitters by virtually "unplugging" them.