Q: iMessage won't go online

I have had my Macbook for about a month & everything has been working perfectly. Today I had to change my Apple ID password & now my iMessage & my Facetime aren't connected to my Mac. When I go to iMessage it says everyone is offline & when I try to make myself available again it ask for a "talk.google.com" password. I type my apple ID password but that doesn't work. Can anyone help me please?