Linksys Wireless-G WRT54G Router "physics symbols list" Questions

I am trying to secure my wireless router and am asked for a PIN number. My router is a WRT54G2. On the bottom, there is a Model Number, Serial Number, MAC address number, and another with a connection

Wireless light not on .... I have done the whole thing with unplugging router and modem and reset both of them but I still have the Wireless light not on but "I" symbol flashing. I can not connect at ...

my wlan has stopped working and is not showing in the the list of device drivers. how do i replace the old wlan card and replace it, i have a HP6031ea laptop with vista I can't find a laptop by that ...