We can see here under, "Operating system", that the U3415W was never tested/validated by Dell with the Apple proprietary hardware and operating system. All we provided were true Windows PC testing and drivers. The lack of a specific Apple operating system driver could be the problem. You should post the issue on the Apple Forum and see what other Apple users have done as far as Apple PC troubleshooting and possible Apple proprietary cabling to purchase. Other Apple users on their Forum have recommended this Moshi USB-C to DisplayPort cable.
DELL-Chris M
Community Manager
•
56.9K Posts
0
November 1st, 2018 08:00
We can see here under, "Operating system", that the U3415W was never tested/validated by Dell with the Apple proprietary hardware and operating system. All we provided were true Windows PC testing and drivers. The lack of a specific Apple operating system driver could be the problem. You should post the issue on the Apple Forum and see what other Apple users have done as far as Apple PC troubleshooting and possible Apple proprietary cabling to purchase. Other Apple users on their Forum have recommended this Moshi USB-C to DisplayPort cable.