Hi,
So I've managed to do it again....changed from pc to mac, downloaded lightroom for mac so didn't have to use parallels.
Moved my files and catalogue that was on my external drive to mac hard drive.
Opened the back up catalogue into new LR. Photos were all missing as expected but sure I can point LR to the one master folder, just can't remeber how....
So have been locating missing photos from folders and restoring folders 1 at a time.
However not all the photos are coming back after restoring or finding the folder...the thumbnail stays blank with the ?. Locate the photo again and it says "The file is associated with another photo in the catlogue"
Any ideas what dumb thing I have done this time???

