Adding hard drive to network

try to power down both devices for a min than turn them back off sometimes they have to clear MAC address.

I DON'T THINK YOU CAN RUN 2 ROUTERS ON THE SAME NETWORK UNLESS ONE IS USED AS AN ACCESS POINT.
1. Connect as local device or bridge - If connecting the second router via Ethernet cable, plug it into one of the LAN ports on the first router. If connecting the second router wirelessly, ensure the second router is set for client mode. Note that some home wireless routers do not support client mode; these must be connected by cable. Check your router documentation for details on its client mode configuration support.

2. Check / change IP address - Most home network routers use a default IP address setting. Often, these default IP addresses will not work in a two router environment. Check the second router's IP address value and reset it if necessary to work within the valid address range of the first router (and to not conflict with any other device on the network).

3. Disable DHCP - To avoid IP address conflicts between all of the devices on the home network, only one of your two routers should assign addresses via DHCP. All mainstream routers provide an option to disable DHCP as part of the router's configuration screens.

Instead of adding a second wired router to an existing network, consider adding a network switch instead. A switch accomplishes the same goal of extending the size of a network, but it does not require any IP address or DHCP configuration, greatly simplifying configuration.
Readers Respond:

This box has to be connected via USB to a PC ...OR... via an Ethernet cable to a piece of network hardware, such as a router/switch/hub.

I recommend the Ethernet cable route.

Once connected, and assuming your router will give the media drive an IP address (you can check this from your router's admin page) then you should be able to browse to the hard drive from the XBox.

First, buy a CAT5 cable from a computer store, then connect it from the laptop to the router.

I am having exactly the same problem. It occurred on Sunday 17th. I have phoned Optus who seem unable to work out what has happened. It will work wirelessly but not recognise it when set up via ethernet cable.

Connect your computer to the router via an ethernet cable and log into the router's admin interface. Make sure that all of the wireless settings are set up correctly. If they are, try changing the mode between G and N or any other choices. Also try and change the frequency to make sure there is no interference.

Perhaps buy one on eBay (possibly $60) and pull it's interface circuit board, to replace your bad one:
http://search.ebay.com/netdisk

DI-624 (Update to FW 2.70+)

See: http://www.infrant.com/wiki/index.php/Hardware_Compatibility_List_-_Network_Switches/Routers#D-Link

the lights on router are not functioning..

Try setting configuring the privledges setting. Make sure there the network setting is correct, and make sure all user accounts have admin access to network