1st of all
now can you go to a dos prompt (Xp its start ---> run --> type in "cmd") you should then have a black screen, here type in "IPCONFIG" and check that the ip for the lan connection is something like 192.168.2.* if it isnt there is a problem with the line.
also how did you reset the pre-n? if you just unpowered it that doesnt work, you would have to turn the unit upside down, and on the top left there is a reset hole that you have to press with something like a paperclip.
the way to reset the pre-n is as followed:
unpower the router
plug in the paperclip in the reset hole
power the router back up whilst holding the reset button and then hold it for 10 seconds.
this should bring the router back.