Ok an internet light on either a router or modem will blink when it is having connection issues. If the light blinks for more than 5 seconds it is not connected. If it is solid, then blinks twice it is just working out some issues. When you hook your pc up to the cable modem do you have any special settings, or do you just switch the cable? If only the cable is switched, you will not have to specify a hostname, and the ip address will be automatic. Which I told you to select in a n earlier post... Has this been done?
If this has been, and you are still not connected i want to see your settings of the router. To do this open the router settings and go to the setup window where it shows the settings. Press alt + printscreen
Right click on your desktop and select new, either a bmp or jpeg file. When it si created right click the file and select edit. When the program opens press ctrl + v (paste). Save the file.
Upload the file to Image shack
http://www.imageshack.us/ and drop the link in this window.
Please answer the question above, dont just assume I know..
Also, ill be back in about an hour, so you have some time.