I recently moved my network to another room. Now I cannot connect either PC to the internet through my router. I've tried switching cables and using new router inputs to no avail. My network works fine with file sharing, etc. The only way I can connect to the internet is by a direct connection to the modem from one pc. Is this a router issue? Can it handle a network okay but not have an internet connection?
If the router has an integrated firewall, disable it (for testing).
If the router has a dedicated socket for a modem, ensure that it is used.
I believe that there are compatibility issues between some modems and routers but I don't have any specific knowledge on this subject - you might try Google.
Also... After connecting the router, reset the modem (ABSOLUTELY REQUIRED) and reset the router. Some modems will refuse to accept changes of mac address even after a reset, therefore, routers typically have the ability to fake a mac address. You could test this by using the mac address of the computer that connects successfully. (Assuming that only the modem sees the fake mac address, the rest of the network will be unaffected).