Why will my car not start with a new battery in it?

Recently changed the serpentine belt. After it was all put back together it would not start. It had no power. So I changed the battery and now I get a little bit of power bit u can't roll up the windows or even start it. What could the problem be?

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No start as in no starter noise, dead silence or you hear starter noise, engine cranking but not firing up? Are both battery cable connections to battery clean and free of corrosion, powdery residue? There may be two main grounds; battery negative to chassis, chassis to engine block. Examine them for corrosion and tight connections.