my monitor does not detect a signal from my computer

I am using the plugable usb 2.0 VGA adapter for a second monitor. I have been using the same model for about a year and it worked fine. One day my second monitor stopped receiving a signal. I thought it may be the adapter so i ordered a new one. It did not fix the issue. I have plugged each monitor in directly with the VGA and they each work fine. the little green lite on the adapter is not lit.

Hello Mike - I will follow up with another direct message asking for logs.