The good side is I now have a new, much faster computer. The not-so-good side is that when setting up the new iMac, Apple suggested I reinstall the programs individually rather than use Time Machine. So I now have a fresh copy of Lightroom 5 from my installation disk, re-loaded the Pictures folder from Time Machine, but when I open the Lightroom folder within Pictures, it says "No photos found." I'm hoping the images are still here somewhere. I searched the Forums but with no success. Any suggestions are much appreciated.