I've got cable modem at home with two PC's, one uses patch cable from wireless router/access point, the other uses wireless connection to the wireless router/AP. This worked fine for months until yesterday, now I can't access internet anymore if I go through the wireless router. If I plug one PC directly into the cable modem, it's fine, so I know internet is available and modem is working. The wireless AP is working, because I can still connect the two PCs over the wireless connection, but neither one can access internet if they're plugged into the AP. I haven't changed any of the settings from what it was before.
Why can't it connect to the internet if both the AP and the modem are working?