This is the 12575th most frequent Russian word.
компьютеру
Dative form of "computer" (to the computer).
Here, "компьютеру" is in dative case, indicating the recipient of the action (the setup).
Мой брат помогает мне настроить компьютер.
My brother is helping me set up the computer.
In this sentence, "компьютеру" again appears in dative case, showing the entity through which the action was achieved.
Я сделал это исправление благодаря компьютеру.
I made this fix thanks to the computer.
"Компьютеру" is used in dative case indicating the indirect object of the connection operation, denoting where the printer was connected to.