Question VGA to HDMI adapter, no signal

[geo141]

I'm trying to connect the VGA port on my Dell Optiplex 9020 desktop computer to a 1080p HDMI monitor using a VGA to HDMI adapter. I am getting no signal. The VGA port works with a regular VGA monitor. Any suggestions?

 

[boju]

Is the cable active, powered by usb or wall plug?