I have a brand new Belkin Wireless G router (F5D7230uk4). It works fine as a wireless router, connects successfuly to the internet via cable modem and allows acces via wireless networking. However, whenever I plug another PC in via a wired port, within 60 seconds the internet and wireless lights go out, the other lights go orange and both wireless connectivity and internet connectivity are lost. I have tried this with two different PCs and a couple of different cables, so I don't think it is down to a faulty cable or network card. Actually, if I plug both PCs in to wired ports they can connect to each other quite happily, but the wireless network disappears.
Any thoughts or suggestions would be greatly appreciated.