My internet is only working when I disconnect the router, I've had this router connected before, I get 4 solid lights on my dsl modem, any idea what might be the problem
You didn't specify if you're using DSL or cable.
I've run into this dozens of times. With DSL, keep in mind the software on the PC is what "dials out" to the ISP with your name / password, and you MUST set the name and password in the router. Otherwise, ONLY the computer that has the software installed (verizon, etc) will be able to connect.
If you're using a cable connection, you don't have to do this, however, most newer Linksys routers come with a 'setup' disk, which MUST be used regardless of connection type.
Click "start" then "all programs" then "Accessories" then "Command Prompt". Type ipconfig/all and hit enter. Write all of this information 'cause you'll need it later.
Power down your modem and restart your computer. Make sure your ethernet cable is in the correct WAN slot. Power your modem back up before restart ...reset your router by holding in the button [with a pen] behind right antenna for 15-30 seconds.
When your computer restarts, open your browser and type http://192.168.1.1. Type admin into each box. Now you're inside your router. Correctly enter the information you wrote down from the command prompt . Each page you fill out, i.e., Setup, Wireless, Security...be sure to click "SAVE SETTINGS".
Any issues you have after that just watch this video.
Router is configured incorrectly. I need more info to help you. who is your DSL thru? is it using PPOE (probably)? are you having trouble thru wireless or wired into router? suggestion...call your DSL provider they should be able to help you ge tthis configured over the phone. If not...let me know...we can work on it.
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