YOU SAID:

the chair doesn't like to walk because of the fallen box

INTO JAPANESE

箱が落ちたせいで椅子は歩きたがらない

BACK INTO ENGLISH

The chair doesn't want to walk because the box fell.

INTO JAPANESE

箱が落ちたので椅子は歩きたがりません。

BACK INTO ENGLISH

The chair doesn't want to walk because the box fell.