Try rebooting cable modem then router and hope.
Given the story, it does sound like either a hang or other failure. But there is no exact advice given the lack of detail.
I lost my wireless internet connection yesterday. I run Windows 7 home. I have the internet via ethernet cable, and the wireless signal is excellent however, it appears that neither my laptop wireless gets the internet (via message in wireless box that states no internet) and my iphone hangs when trying to access the internet. It seems that something is broken from my wireless router. Any suggestions.