Why can't my laptop connect to Wi-Fi?

So, my iPhone, nook, mom's iPhone, mom's iPad… It all connects to Wi-Fi. And the router is downstairs, & everything connects to it except my laptop. But the thing is my laptop USED to connect. Other things are connected too, but those were just a few things connected that are in the same range with other stuff. Like, I'm on my laptop now, but I'm sitting right next to the router, and when I get to my room upstairs, it tells me there's no connections found, even though everything else like my phone connects from up there. What might be the problem?

Some decoders have a Wi-Fi button when pressed will lock on automatic, also some laptops have to have there Wi-Fi switched on (like mine) which is next to the button with a circle and dash in it

Dude lol the answer to this question is pretty simple and obvious… If your router is in a room which has a lot of converging walls it'l block the signal range and will lessen the amount of signal which can be received in your laptop when your upstairs… There's not solution other than shifting the router to a place which is closer to your room n closer to the place where you guys operate your gadgets… N if more than 2 devices are being operated on the same Wi-Fi then your net will work slow.

Simly, Some decoders have a Wi-Fi button when pressed will lock on automatic, also some laptops have to have there Wi-Fi switched on (like mine) which is next to the button with a circle and dash in it

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