Windows says no WiFi adapter — but it was working yesterday?
Short answer: When Windows shows "WiFi adapter not found" or the network icon shows no wireless option at all, the cause is almost always software — a corrupted driver, a stopped Windows service, or the adapter hidden by power management. Run through these four steps before suspecting hardware. The physical WiFi card rarely fails without a physical drop or liquid event.
How to fix WiFi adapter not found — step by step
Step 1: Check the Fn WiFi toggle and Airplane mode
Before opening Device Manager, check two quick toggles. Most laptops have a hardware WiFi key on the Fn row (often Fn + F2 or Fn + F12 with a wireless icon). If the LED next to it is off or amber, the radio is hardware-disabled — press the key to re-enable it. Second: press the Windows Action Center icon (bottom-right corner) and verify Airplane mode is Off. Airplane mode cuts all wireless radios including WiFi and Bluetooth at the OS level and makes the adapter appear absent. These two checks take 30 seconds and resolve about 10% of "WiFi adapter not found" calls we receive. Our laptop WiFi not connecting guide covers the broader range of WiFi issues including connection drops and slow speeds.
Step 2: Show hidden devices in Device Manager
Press Win + X and select Device Manager. In the menu bar, click View → Show hidden devices. Expand Network Adapters. Look for your WiFi adapter — it will be named something like "Intel Wi-Fi 6 AX201", "Realtek RTL8821CE Wireless", or "Qualcomm Atheros QCA9377". If it appears greyed out (hidden state), the adapter was disabled by Windows' power management aggressive power-saving profile. Right-click and choose Enable device. If it has a yellow warning triangle, right-click and choose Update driver → Search automatically. If Device Manager finds an updated driver online (requires an Ethernet cable plugged in if WiFi is down), it will install and the adapter should reappear. For more detail on driver issues, the Windows BSOD guide covers driver-related system errors in depth.
Step 3: Restart the WLAN AutoConfig service
WLAN AutoConfig is the Windows service (background process) that manages all wireless network connections. If it stops — which can happen after a Windows Update or a system crash — the adapter appears completely absent because the management layer is gone. To restart it: press Win + R, type services.msc and press Enter. Find WLAN AutoConfig in the list (scroll down — it is alphabetical). If the Status column shows anything other than "Running", right-click and choose Start. Also right-click → Properties → Startup type and set it to Automatic so it always starts with Windows. After starting the service, the WiFi icon in the taskbar should typically reappear within 30 seconds without a restart.
Step 4: The India angle — driver rollback after Windows Update and power management traps
India's Windows update cadence creates a specific pattern we see weekly: a laptop connects to WiFi normally, does a Windows Update overnight, and the next morning shows "no WiFi adapter". The cause is that Windows Update replaced the OEM Intel Wi-Fi 6 driver (customised by HP, Dell, or Lenovo for their hardware) with a generic Microsoft driver that does not support the full feature set of the card. The fix is a driver rollback: Device Manager → Network Adapters → right-click WiFi adapter → Properties → Driver tab → Roll Back Driver. If Roll Back is greyed out, download the specific WiFi driver from your laptop brand's support page (HP SoftPaq, Dell Drivers & Downloads, Lenovo Vantage) and reinstall it manually. For Power Management: right-click the WiFi adapter in Device Manager → Properties → Power Management tab → uncheck "Allow the computer to turn off this device to save power". This setting causes Windows to disable the WiFi card during sleep and sometimes fail to re-enable it — particularly on battery-optimised profiles common on Dell Inspiron and Lenovo IdeaPad models sold for the Indian market with aggressive battery-saver defaults.
When to call a laptop repair service
When DIY ends
Stop the software route and call a technician if: the WiFi adapter never appears in Device Manager even after a clean Windows reinstall; the laptop was dropped or had a liquid spill before WiFi stopped; or the BIOS shows the WiFi card as disabled and you cannot locate the setting.
Typical repair cost in India
Driver fix / service restart: included in ₹149 doorstep visit. Physical WiFi card (M.2 form factor — a compact circuit board) replacement: ₹1,200–₹2,500 including the new card and fitting.
A note from the LRW Engineer Team
The WLAN AutoConfig service stop is the most under-diagnosed cause of "WiFi adapter not found" and the easiest to miss. Device Manager looks normal, no yellow triangles, the adapter is visible and enabled — but no WiFi. The service simply stopped. Check services.msc before spending an hour on driver reinstalls.