One way to resolve this problem, assuming that your file structure for your images on your new drive is identical to your old drive, is to re-label your new drive with your old drive's name. LR should not know the difference between the drives. It just wants a drive with that name and with those files as they were imported into your catalog. The other option is to point LR to the new location within the Library module.
Thanks for the help. I called Adobe tech support. 3 days later I have everything in My new external HD. The problem I lost all of the collections. Adobe said there was not way to save them. I was not to happy 4yrs of work and I do every thing in collections. bob
Please tell me they didn't just get you to import everything into a new catalog? I do sometimes wonder what on earth Adobe's support are thinking.
You said you still had your catalog - if you double click on it, does it all look normal (i.e. with collections) except for question marks everywhere?
Adobe said by me dragging everything over to the new drive it caused the problem. I told the tech person I still had everything on my old drive. But he had me make a new catalog. bob
Thanks you Ken for taking the time to ans. in such great detail. big bob Happy Holidays