2015 macbook pro 15 detects external monitor but LCD screen is black

This is the second same model laptop with this issue.

When I boot the laptop the apple boot screen shows on the Dell monitor. The MacBook display is black. If I do Detect Display, Command F2, NVRAM Reset Command - Option - R- P, the display comes back on and works great. If I shutdown and restart, the same thing happens again.

Model N

Setup information: The laptop is connected to a Dell 2408WFP DVI to Mini Display adapter. (This monitor has worked on all my other MacBook Pro's)

Model Name: MacBook Pro

Model Identifier: MacBookPro11,5

Processor Name: Intel Core i7

Processor Speed: 2.8 GHz

Number of Processors: 1

Total Number of Cores: 4

L2 Cache (per Core): 256 KB

L3 Cache: 6 MB

Memory: 16 GB

Boot ROM Version: MBP114.0172.B00

AMD Radeon R9 M370X

I have tried everything I can find anything on the internet. Nothing seems to work. I'm not real thrilled about going to the Genius Bar.