try and explore your WiFi router setting if any one have changed that...

 

Have you MAC-locked the router by accident? (Not sure how you would but...).

Check for something under the wireless security section like "Only allow the following computers to connect" followed by a list of allowed MAC addresses.

 

strange...!!!

try rebooting your router...or rest it

 

Have you access to your router's setting?
Is this access password protected (not only with the default factory password) ?

With the default factory password set, some routers can be hijacked from from internet. On your (Windows) PC you wouldn't even notice that, WiFi would be running normally.

Harry

 

Like others have suggested, pull the power out of the router for about 30 seconds, reboot and see if there is anything changed. This is always the first step to take IMHO.

 

I didn't mean the password for WiFi.
I meant the password to enter the router's management (for to do the WiFi setting).

But I think also your first step should be the reset of the router.
EDIT: I see, you have that already made.
Next step would be to restore the WiFi password or set a new one.

Harry

 

I had the same issue and I changed the Wireless Router Channel setting from "automatic" to "Manual" and used channel 6. It all goes perfectly now. I am in New Zealand and I think some of the channels are not used here, or overseas.