Hi Jeff, Yes - I reread that and meant internal hard drive - not mother board. This past year first my internal hard drive crashed and was unrecoverable. Three or four months after replacing the orginal HD with an SSD the video card on the mother board failed and needed to be replaced. My error. As to how to proceed - I stand by first make sure you have a Time Machine back up for your system, something like Dropbox for you documents, a copy of your photos on a second external drive (and a cloud based service) before deleting anything... and yes moving your files from one location to another within Lr. What I wanted to mention is that if you don't move your files from within Lr and you have to locate the new drive it is easily done. Question marks and exclamation points aren't the problem... losing your original files by deleting them before you have them fully backed up is what you don't want to happen. Good luck!
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