If the problem continues, then perform all the prescribed steps from this link:

If not, you will probably have to replace the card. Depending on the specific model g6 notebook you have, you may have to replace the wifi adapter with the exact same model and part number, or the BIOS will reject it and the notebook will not boot up until the unsupported wifi adapter is removed.

If your printer connects to a Wi-Fi network, disconnect your computer or mobile device from the network name (SSID), and then reconnect it to the same network name your printer is connected to. If the printer is available and has a ready status, the issue is resolved.
All went Ok appart from the fact that I cold not switch the WiFi on via the F12 button (with or without the Fn button or the Ethernet cable connected or not). It just turned the 'Airplane Mode' on / off. I even created a media disk and did a clean install, no difference. I eventually solved the problem by starting the laptop using the 'Web
Yet another Wifi problem post on the HP Stream 7. The tablet will not connect to any available WiFi Routers. We have both a Cisco router upstairs and the Comcast Router downstairs. My phone, my laptop, and all our other devices can see the access points but the Stream 7 reports 'No connections are available' on the Windows Start screen.

Boot into the BIOS of your computer. Go to Peripherals and set the WiFi option to Enabled. The titles vary depending on the OEM. Save the changes and come out of BIOS. Finally, check if the issue

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hp laptop wifi not working windows 7