Mac mini does not connect to the internet via wifi

I currently have a Mac mini that cannot connect to the internet. I also have an iPad that is connected to the same router/modem wirelessly. I have tried the network diagnostic in the network utility app. It is showing I'm connected with green dots.. But still no luck.

Yes I tried calling the ISP, there was some issues with the service but they fixed that and it was working just fine a few hours ago but then later in the evening it stopped connecting. I know my router modem is working because I'm typing this with my iPad ..

Im going to call apple tomorrow and try to get another modem router as we'll. Just thought I would try here also..

if i if I have to restore my Mac mini to factory, will there be a way to keep my iTunes music .. .?

thanks