My husband’s MacBookPro screen just went Black, what to do?

Without knowing the exact model or more details it is hard to say. See if your laptop qualifies for this free Apple repair program:

https://support.apple.com/13-inch-macbook-pro-display-backlight-service

Connect an external display to see if the issue is with your built-in display. You may need to close the lid of the laptop to force the video to go to the external display. Regardless, most likely you will need to have Apple or an Apple Authorized Service Provider examine the laptop and provide you with an estimate for repair.