IBook has stopped connecting automatically to wireless network

I just got my iBook back from repair at Apple (a display problem), and now I have two minor, but annoying, problems. First, the computer no longer automatically connects to the wireless network at my work, but every time the computer goes to sleep or I restart it I have to pull down the AirPort menu and select the network to join. I don't have to enter a password, I just have to select the network on the menu.
The second problem is that I used to have the computer log me out whenever the screen saver came on (after 15 minutes) so if I left my office for a while nobody would be able to access it without the password. This isn't working now and I don't know how to change it.

Hi, I have tacked on to this thread as I have the same problem... I can't connect and have get the spinny ball when I try to open internet connect.
This happens every time I update, and I too usually fix it by updating the keychain. However, this time the box only popped up as I was restarting and i couldn;t click it in time, and it hasn;t reappeared since.
How can I fix this?

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