I have about 4000 pictures, half raw files half jpegs. I saved all the pictures to an external hard drive. Also saved the catalog file. Loaded lightroom cc on new mac. Opened the catalog. Tried to import all the pictures but it froze halfway through the process. Cancelled it. It looks like my catalog got loaded because I see the collections but the pictures aren't there. I tried to import again but it acts like all the pictures are duplicates. I have no idea what to do. How do I delete everything and start over ?
DO NOT REIMPORT YOUR PICTURES!!!!!!!!!!!!!!
What you need to do when moving a catalog to another computer is simply open it on the new machine and relink the top level folder location to its new location on the new computer. Simply right (or control) click on the folder in Lightroom and select "Update folder location" and then point Lightroom to where that folder is on the new computer.