[SOLVED] Second monitor recognizes laptop input, then sleeps

Jun 26, 2020
I have a second monitor I use to extend the desktop on my laptop. It previously worked fine, but now it recognizes the laptop's input and sleeps after displaying the extended top for a second or two. I have tried unplugging the monitor, checking cable connections, and restarting the laptop.
Laptop is a Dell Precision 5520 running Windows 10 and the monitor is an Asus VE205. They are connected via an HDMI to VGA cable. Thanks for any help!
Top suspect at this stage has to be that HDMi-VGA adapter cable --- so I would start by replacing that --- make sure you buy an active one though, and don't buy the cheapest.