What do you have

Alexa, Turn on Kitchen PC
Alexa, Turn off Bedroom PC

Den PC is on
Den Motion is inactive
Using Den PC
Wait 1 Hour
Turn Off

I am surprised that ST doesn’t have a native turn on/off PC app. I did a tutorial on how to use ST to turn on/off a PC and how to use the PC as a presence sensor for HA purposes. Even went further with using a cool app here called Host Pinger to sync the Virtual Switches to the actual PC state so it doesn’t matter if the PC is turned on/off physically or through ST.

Moderate Installation: