If you're using OS X Yosemite v10.10.3 and one of the following iMac models, viewing certain very large JPEG (.jpg) images in the Finder or Preview might cause your iMac to restart. Specifically, your iMac briefly stops responding, displays a black screen, then restarts to a message that your computer restarted because of a problem. If your iMac doesn't restart, it might instead display the image as an all-gray image.
- iMac (Retina 5K, 27-inch, Late 2014)
- iMac (27-inch, Late 2013)
- iMac (21.5-inch, Late 2013)
Update to OS X Yosemite v10.10.4
To resolve this issue, update to OS X Yosemite v10.10.4.