ACER Swift Edge 16 USBC Video Output is not present
I have an ACER Swift Edge 16 Ryzen laptop which is less then 3 weeks old. I use the USB C to output video to a 2nd screen (Dell U3219Q) with a USB C connection also. When first purchased the video, data and laptop charging were present. Now for no apparent reason the video is not working. I have tried new cables and even re-built Windows from scratch without success. I have an HP Envy which I use with the same screen and cables without a problem. Device manager is not showing any errors and I've update the BIOS on the laptop and checked the firmware of the screen which is up to date. Next step is to return it to the shop for a replacement ! Any clues ?
[Edited the thread to add model name to the title]