YOU SAID:

my teacher told his computer to shut up

INTO JAPANESE

私の先生は彼のコンピューターに黙らせるように言った

BACK INTO ENGLISH

My teacher told his computer to silence

INTO JAPANESE

私の先生はコンピューターに沈黙するように言った

BACK INTO ENGLISH

My teacher told the computer to be silent

INTO JAPANESE

私の先生はコンピューターに静かにするように言った

BACK INTO ENGLISH

My teacher told the computer to keep quiet

INTO JAPANESE

私の先生はコンピューターに静かにしておくように言った

BACK INTO ENGLISH

My teacher told the computer to keep quiet