Nothing has happened to my computer. It hasn't been dropped or mistreated in any way. The computer dude at my area Apple store showed me how to delete all my previous recognized locations, which I've done. I've run through the network setup wizard a dozen times, shut off and turned on the power strip that my wireless box and router are plugged into several times... Nothing doing. Throughout, my mother continues to connect to the internet without trouble. I currently type this on her computer, which is surfing the web just as fast as ever.
A few times the network setup has requested a password, which neither my mother nor I know. Her ex-husband, with whom we have no contact, installed everything. We don't want to go in for a whole new wireless network because we're moving soon and her computer is working fine-- But I've been assured by the nice folks at Mac Outfitters that there's nothing the matter with my computer, and it's a problem with the network.
Am I cursed? Is my laptop suddenly allergic to Comcast? If you've heard any of this before and know how to help, please reply.