It seems to not make sense that I would need to right click on a folder to tell LR where it is located because the original photos never moved. Well, I tried that and then the folder disappeared from LR instead of staying in the same location and just being good to be used (minus the questions mark) so all seems wrong.
Since you didn't tell us your oeprating system, let me assume its Windows and point out that an external hard drive might be E: on one computer and F: on another, and thus Lightroom thinks the photos have moved. If its E: on both computers, then you wouldn't have this problem. You could instruct Windows to change the letter of the drive back to what it was on the old computer.
Your folder did not disappear. If you followed the procedure (sounds like you did), then instead of looking for the folder on (to continue the above example) your E: drive in Lightroom, it's not there anymore, but it is found under the F: drive because you just told Lightroom to look for these photos on the F: drive.
That was it! The drive letter!!
When I changed it alerts that something may not work later on.... is that anything to worry about?
Thanks so much for your help!
Thank you for your help. It was the drive letter that was different from the 2 computers.