This could be due to corrupt wireless drivers or corrupt BIOS settings. To isolate this, uninstall and reinstall the wireless drivers on the notebook. If issue persists, then update BIOS and check for the issue. Incase, if the issue is unresolved, then check if the Wireless network adapter is detected in Device Manager or not.
If it is not detected, then remove and reseat the wireless network card on the notebook. Incase, if the issue is unresolved, it clearly states that the wireless card on the notebook has gone bad. At this point, I would suggest you to take the notebook to any nearest Authorized Service Center in your location.
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