Well error code 8002A548 is described as "The PlayStation 3 is having problems connecting to the PlayStation Network". I'm thinking it might possibly be a problem with the wi/fi in your PS3. It's not an invincible product. There can be problems with it. I would try what other people have said one more time, and maybe call your cable provider and ask them to do that one more time. If that doesn't work, then I would call Sony support and/or send your PS3 in so they can look for a system problem. If the cost of repair is over $249.99, then I would just get a Slim model.
Well I was thinking of trading my PS3 in for a slim model and jsut paying $99 (I guess Sony is doing this now instead of repairing ect...)
Edit: thread locked due to necro post