Toshiba Satellite L450D-124 - Internet doesn't work

Hello, suddenly my internet on my laptop stopped to work, everything should work since there is no sign of an error or something. According to my settings it should work but when i try to do something that requires internet connection it says that the webpage can't be viewed or internet doesn't work. Apperently it does work when i connect through lan. But through wifi it doesn't. Anyone can help me with this problem? I resetted my whole laptop so there couldn't be any virusses or something.
Thanks in advance,

Hi guys, thank you so much for your help!
I tried to do the troubleshooting like suggested but unfortunately the screen does not show anything!!
I am so disappointed with Toshiba since I have paid about 1000 bucks on this laptop and just after one month of the end of limited warranty it got a problem!!
Please if you have another suggestion and troubleshooting please let me know.
Remarks: I am living in Brazil and here we do not have an authorized Toshiba Service Center.

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