I have used Lightroom since the first edition. I understand the (?) and connecting missing links. I have done it before with no problem. I have a book and have tried every site I can find but I do not know what the problem is. I have whole folders of images showing the ? but when I try to locate they are not showing anywhere in my finder. There is a whole group from August to October 2012. I am at my wits end. Have spent two nights on this and am not sleeping. Where can I go to get some help as to what has happened. Thank you.
If you cannot find the image in Mac Finder, then they are not on your hard drive.
Mac Finder (or Explorer on a Windows machine) is THE tool to investigate what is on a hard drive.
But before you come to conclusions: look everywhere, on every hard drive. Do a search with Mac Finder on your whole system.
And don't forget the Trash Can.