HSK 3
开机
kāijī动
to start an engine; to boot up (a computer); to press Ctrl-Alt-Delete; to begin shooting a film or TV show
电脑开机以后可以用了。
Diàn nǎo kāi jī yǐ hòu kě yǐ yòng le.
The computer can be used after it starts up.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 3.