hi guys, im new to this forum

plz help.
i have virgin media broadband and have only one pc in my home. the internet connection works fine.
i recently bought a ps3, i was suggested to buy a linksys WRT54Gs router to go wireless so i could hook my ps3 up to the net.
i bought the router and have since been having problems connecting to the internet. when my virgin media modem is plugged in to the pc using a usb cable the internet works, but when i hook it up through the router with a ethernet cable it dont seem to work.
its wierd because when my pc is switched off my ps3 detects the wireless connection, but as soon as i switch my pc on the internet conection fails and the router fails to detect the ethernet connection.
i have tried changing my ethernet cables but it still dont seem to work.