Where did my photo files/thumbnails go?
I was going to do a clean install of Yosemite on my Mid-2012 MacBook Pro, so I decided to is my Touro 1TB external drive to back up my computer via time machine.
The process finished and I went ahead and deleted things I no longer needed before reinstalling a fresh copy of the OS. This was on the 21st. Today, the 26th of January, I was trying to get into my iPhoto library (which I transferred over to my external drive), but when it starts to rebuild the thumbnails, the progress bar goes to just under half way and then "completes" itself. I have photos on my MBP dating back to December 2011 that show up (thumbnails and all), but for August 24th, 2014 and then from September 19th, 2014 up to present day, there are no thumbnails of any photos, and when I click on any "blank" photo, a picture appears that looks like a warning sign with an exclamation mark in the middle. This is the case for all photos on August 24th and then from September 19th to present day.
I have tried iPhotos internal fix, of rebuilding the database, thumbnails and library, but the problem still persists. I have also downloaded iPhoto Library Manager, and the problem is still there.
I have not tampered with the backup on my drive, but I cannot get my photos back. I have also tried to restore my computer via Time Machine, but it says the drive cannot be read (although I am completely able to access the drive).
Any help would be appreciated.
MacBook Pro, OS X Yosemite (10.10.5), iPhoto 9.6.1