I got the call earlier than expected from #Apple that my laptop was fixed and ready for pickup! They replaced the monitor & logic board which solved the black screen, and it cleared up the thunderbolt port problem. Thankful that the hard drive and all the data appears to be ok. Good thing my #AppleCare still had two months left and didn’t expire yet. The two morals of the story are to get the AppleCare, and to always back up your data on a regular and frequent basis. You’ve been advised.