My internet was fine when I went to sleep last night but when I got up today it was giving me the yellow exclamation error. According to my internet provider, Comcast, they can ping the modem and everything, it just won't connect to the internet. The diagnostic is telling me " Windows cannot communicate with the device or resource (primary DNS server)". We've tried restarting the modem, the computer, etc. She had me go in and look at my network settings and they're fine. She even deactivated the modem on the phone and nothing. I have a desktop with windows 7. I do NOT have a router. The internet goes from the wall, to the modem, to my computer. I can try to give any other info you might need.