The program wasn't working, so I had to restart the computer.

这个程序无效，因此我得将电脑重新开机。

It can restart the computer; it can shut it down.

它可以重新启动计算机； 它可以将其关闭。

Then, I thought I would restart the computer to see if it was still working.

然后，我想我会重新启动计算机，看看它是否还在工作。