Motorola Cabel Modem & Netgear WGT 624 Router Problems

ponty pc's

Beta member
Hi folks.
looking for a little advice, motorola sb4200 cable modem connected to a netgear wgt 624 wireless router.
ISP was blueyonder and is now virgin media.
can anybody give me the configuration details please.
desktop pc connected to the modem via usb works fine, the problem is connecting the netgear wgt 624 wireless router to the modem via the ethernet port , the router can not detect an internet connection and therefore have no internet access via the router.
thanks people.