White lines on monitor screen

Thank you for your message.

Does this happen with any particular browser?

Power off the monitor, disconnect all the cables from the monitor, press & hold down the power button for 30 seconds.

Connect only the power cord & start the monitor, this will run the monitor self-test, check if the line is seen here.

Please click on my Dell username & send a private message with the service tag, registered name & email address.

* Run the U2715H Factory Reset page 44, Self-Test, BID (Built-in Diagnostic), page 54
* If you do not see the issue on the BID colored screens, then the monitor itself is fine. The fault must be the computer, operating system, video card, video card driver, or cabling

Chris, it only happens in Google Chrome browser.. nowhere else. I tested it again Firefox, Microsoft Edge.. and it only happens there for some crazy reason.. Not even in any app that I use but only Chrome.

Then you should post the issue on the Google Chrome forums. 

Try using the browse in incognito mode & check if the issue persists. Press (Ctrl+Shift+N) to open incognito mode.

If the issue does not occur, then this could be caused by an extension installed.

Type Chrome://extensions in the address bar & remove one extension at a time & check if the issue persists.

Try reinstalling Chrome if the issue persists.