2nd monitor not detecting (Intel HD Graphic 630)

Hi Bette: Thank you very much for contacting the Intel® Graphics communities. We are sorry to hear the second monitor is now not being detected.
 
In regard to your inquiry about the driver, we recommend to install the graphics driver provided by the manufacturer of the board, in this case ASrock, look for VGA driver 4542:
https://www.asrock.com/MB/Intel/B250M-HDV/index.asp#Download
 
If the problem remains after that, then we can always try to install the latest driver version which is 4849:
https://downloadcenter.intel.com/download/27266/Graphics-Intel-Graphics-Driver-for-Windows-15-60-?product=98909
 
Just in case, on the link below you will find the instructions of how to install the driver manually:
https://www.intel.com/content/www/us/en/support/articles/000005629/graphics-drivers.html
 
Based on the fact that the second monitor worked fine when you switched the cables it indicates that the problem could be related, as you mentioned, with the DVI cable or with the display adapter itself, since both monitors worked fine with the docking station as well.
 
Additionally, if any recent software/hardware changes were done, like a Windows update, the issue could be related to those changes as well.
 
Any further questions, please let me know.
 
Regards,
Alberto R
 

Bette: You are very welcome. We can try the following, copy the link provided and paste it on a different window, you should be able to access it that way.
 
Any questions, please let me know.
 
Regards,
Alberto R
 

Hi Bette: You are very welcome. Thank you very much for providing those results. Yes, in this case it seems to be a hardware failure and the warranty option on the device will be the next thing to do at this point.

Any questions, please let me know.

Regards,
Alberto R