How do I ix my adsl2 comtrend modem when the internet light will not come on

Need a bit more background on this.
Did you just go out and buy this device and hook it up to the phone line ?
Are you using ADSL line Filters ?
Did you ring your internet service provider to guide you through setting up the account settings in the modem ?
How are you connecting to the device to your P.C ?

The settings on the television are bad. You need to change the settings to turn DHCP ON.

You can try the latest COMTREND single port model "CT-5072T"

Try resting it by holding the rest button in for 30 seconds.

DO NOT INSERT A PAPER CLIP TO RESET THE MODEM! unless you know how to reprogram the router, this includes having complete knowledge of ALL the settings required by the ISP AND having your username and modem password (modem authentication passwords are not usually provided to the customer) Doing a "hard boot" will only return your modem to factory settings

Most routers are the same. admin/admin or admin and no password.

This should explain it...http://www.helpwithpcs.com/internet/internet-connections.htm

From the ISP (this is a specialized router for DSL only.
Call your Internet Service Provider.
Asymmetrical Digital Subscriber Line (ADSL

You dont need a Belkin Disk to set up - this can be done manually you can get a manual from this site http://en-us-support.belkin.com/app/product/list/q/routers/ select G in the first dropdown and then your model - theres two to choose from and then then the version
you have a choice - you could change the comtrend router to just use the modem - bridged mode - they have a few different routers see here http://www.comtrend.com/links/i$residential-adsl2-modem-router$product.htm so not sure which one you have if you can bridge to just use the modem then connect tothe Belkin and all PCs should connect to the Belkin
OR you can connect two routers together Leave the comtrend router set as it is -
Set the IP address of belkin router to same subnet as the comtrend. Depending on the DHCP range of the comtrend router - set the IP outside this range - so if comtrend is set to give an ip of 192.168.0.2 to 192.168.0.100 - set the belkin to 192.168.0.254 Disable the DHCP in the belkin.
Connect the comtrend LAN to one of the Belkin LAN ports - you may need to use a crossover cable. On the belkin the WAN port will be left unconnected

If you want to connect to the wireless network you can connect one of the 4 ports to the ADSL modem, this will allow the device to switch between the Wireless network and the wired network. You could also purchase an access points instead of the router but the result is the same, is just that you won't use the routing capability of your Wireless router.