Wireless not seeing wired LAN on Belkin

Our Belkin wireless LAN works well with 3 PCs. Having moved the modem/router I can now plug one PC in by wire. When I do this, the wired PC can get access to the internet but can’t see the rest of the wireless network, which contimues to work well. The Router is F5D7630. How can I use wired and wireless together?