Well, besides that you cant sign in to PSN do you have any other problems? for example:You console gets frozen, your console restarts randomly.
Yeah, bricked systems is pretty bad. Just follow IGN's advice, here http://www.ign.com/articles/2013/06/19/playstation-3-firmware-update-bricking-consoles. If you see the firmaware update come back, don't download it untlil you see that it's been cleared. For those that have already downloaded it....um sorry.