No. you shouldn't need a reboot.

So my next step would be to try a different computer.... maybe a laptop with an HDMI out. see if that will work. and swap to a different cord as well.... all steps in playing detective.

All these modern things should automatically detect the input type and make the mode changes needed.

Borrow the cable from your TV if you have an HDMI DP cable there.

Another option is to call Dell tech support or chat to get help from them.

Last edited by Guitarhacker; 11/30/18 09:26 AM.
You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.