Aspire 5517 not connecting to wifi

Last few days been working on my laptop using wifi with no problems. Shut off computer last night but when I powered it up this morning it will not connect. I goto the bottom right of my screen, click the up arrow showing and see my wifi connection with a yellow triangle in it. I click the wifi options and see that my router there at full strength. It says I am connected when I click on it, I click disconnect then try to reconnect and it won't connect. Its an acer aspire 5517 on window 7 home premium if that helps. I have tried to check and see if driver needs updating but it says everything is fine. ANY AND ALL suggestions would be great!! I can plug an ethernet cable in and it works fine. Also my cell and iPad connect no problem. Also tried a system restore and that did not help. Thanks in advance

 

Have you turned the wifi switch off "see the service manual" (button 3) as indicated in the manual. http://tim.id.au/laptops/acer/aspire 5517.pdf

 

Try going into your command prompt as admin, then type ipconfig /release. After it gives you a new line type ipconfig /renew.