Hello! I have installed to my old lenono the new os x yosemite via a bootable usb device. While installing I was asked "how do you to connect to the internet?" and the option "via wifi" was blocked to me for marking, so I marked "My computer wont use the internet". Now, after insatalltion, how can I connect? (may help you: When I open network on settings, there are no services) thank you!