My Surface pro no longer displays to my monitor

Hello,

I am part of the Windows Insider Program. I currently display the following on my home screen
Build 17074.rs_prerelease_flt 180116-1539

I'm not exactly sure how long I have had this issue but at least several months. I use a Mini DisplayPort to VGA Adapter connected to my monitor. All of a sudden I lost the ability to display from my Surface Pro to my monitor. Today, I went through all the trouble shooting steps, hooked up other laptops to make sure the monitor works (it does) spent a long time with a nice guy at the MS Help desk. He installed the Surface Pro Drivers/Firmware.........

Finally, he said he has done all he can to help me without reinstalling Windows. Since he saw I was on the Insiders program he suggested I reach out for help here. I'm sure this happened after a nightly software update but can't prove it. I also purchased a new adapter to day. Still not luck. My monitor is telling me it is not receiving a signal from my Surface tablet.

Any help will be very much appreciated. My neck is killing me looking down all day!
Thanks

Well thank you. I'll give it a try right now.

Hello again,
OK, I tried both of your suggestions and unfortunately it did not work. I keep getting the same error message from my monitor.
- no input signal detected-

This has me baffled. Next steps??
Be well and thanks

Hello Dude,

Still nothing. I've included a few screen shots to show you what I am looking at. The monitor as shown in the Device Manager shows the monitor working. All drivers have been updated per your instructions. When I go over to the Settings Page and look at System/Display it does not find it. As I scroll down to the bottom of that page you can see that the display options. I open up the drop down and select any of the options like "duplicate this display" nothing happens and the box below that says " make this my main display" remains greyed out.
Puzzle remains unsolved in Bentonville!