All Photos in the Catalog have an exclamation symbol without the picture after backup

All Photos in the Catalog have an exclamation symbol without the pictures/Images 
I have 2766 images and when I updated my backup H/D I must have hit something in error.
At 81 years old it is not hard for me to make a computer mistake, LLOL
I tried to use the backup which is 2 weeks old, that did not work and even a previous B/P one.
I have all the pictures on my computer in a folder called Lightroom in pictures, I believe that is generrated by LR, it has all the NEF and xmp files to the photos.
I also have other Tiff and jPeg files as well in the catalog.
The folders also now have question marks.

Thanks in advance,
Greg

If I click on the exclamation point it asked to locate the file, having 2700+ images there should be a way to get them all changed at one time, doing one at a time would take a very long time with the hope that I would get them all.


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