So, I got the XB321HK Monitor today prior to this post and hours before this post to this day.
(Yes, new pc)
When I turned on the monitor, I saw "No Signal" there was NO white circle with crossed lines.
After the monitor found signal, Boom! The circle with crossed lines strikes in. Making the account, The Welcome Introduction, Desktop, In any app. The circle was still there except if it says "No Signal". I tried refreshing, restarting, messing with the display settings and control panel and nothing worked.
Here are some photos that may help you:
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Please ask me some questions or information that I haven't explained. Help is greatly appreciated!
[Edited comment to delete personal information]