Did you use the settings from the old router? Or is it broke?
When setting it up as Static IP I used the addresses from the old router.
I would try putting the old router back in, get that to work, and then connect the new router to that. See if it at least connects to the internet through your old router?
To answer your earlier question - you only need to contact your ISP when changing the cable modem.
Do you have revision A or B?
http://support.dlink.com/ProductInfo.aspx?m=DIR-850L
And FurryNutz is going to ask you about what cable modem you are attached to, and where are you located? USA? else where in the world?