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How and when this problem started ? It started automatically or after downloading some software or changing some settings in your computer it started happening.
1. Check whether the laptop has a WIFI button, make sure the WIFI is on.
2. Restart the laptop.
3. Try a different laptop to see whether it has the same problem.
If the Problem is caused by your laptop, please let me know
1. Restart the router.
2. Make sure that the WLAN light is on or flashing
Does the issue still persist ?
Please provide your valuable rating to me .