I can't connect my laptop to home wifi, this is the 1st time it happen, not only laptop but i cant connect?

[ICE]

my android phone to wifi either, so which means the wifi is not working even though the internet connection working fine, i have two desktop computer at home and have no issue with internet connection, just not my laptop or anything similar that needs to connect by wifi. This is the 1st time it happen, and I am inside home withing my Router's range. How can I fix this?
I have already unplug and replug my router, this only help when I have internet connection issue, the internet is working fine, just the wifi connection, suddenly I cant connect my laptop or any similar device through wifi

[Napalm Fury]

Unplug your router for 10 seconds and plug it back in.

[Visualmusic164]

Log into the router using an Ethernet connection and see if the WiFi password has been changed or deleted.
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[Pradeep]

go to your desktop,open your browser and type 192.168.0.1(most of the routers) enter and login to your router.
you will get a gui of your router.click on wireless config,check those settings there.

[David]

Hi

you need to do it to change your WiFi broadcasting channel. Open up your router`s setup by entering the default gateway IP, enter username password if prompted ->go to WiFi or Wireless Lan setting and make sure that broadcasting is b/g/n mixed mode, then check what broadcasting channel is selected starting from 1 to 11/13, in case of extreme start or end make in middle like 6 or 7 and in case of any middle number like 6 to 8 make it either 10 or 3. By changing the broadcasting channel shall hopefully stop any interference with other frequencies. If that did not work then you might have to recreate the SSID for your wireless network and then go to subsection security and select WPA2-PSK or simple WPA-PSK then enter your desired network key.Change the channel number as listed above. Once done with all these things then click apply and reboot if prompted.
Good Luck.