Why can I not connect my I mac to Internet?

I really don't know what happened. I've been using this Wi-Fi modem in for over a year, and suddenly my computer says I need a password. I've entered the WPA password, but it says it's wrong. Now, I have no problem connecting with my iPhone, so I don't understand what's going on. Any clues?

Do a HARD reset of the modem, problem solved.

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