If I stay on iPhoto too long, my screen goes black.

Question

Hi all,
Recently, I was editing a photo in iPhoto when suddenly the screen went black.  The computer hadn't switched off because the backlight keyboard was still lit. 
After many restarts, I finally realised that if I were to open iPhoto and leave the appellation open for about 20 seconds, the screen would go black again.  Eventually iPhoto said that my library could not be found and I had to go through the process of rebuilding my library.  I now have all of my photos again, but the problem persists.  If I open iPhoto and use it for about 20 seconds, the screen goes black.
Does anyone have any suggestions for this strange problem?
Thank you.

Answer 1

Log into another user account on your Mac and see if the problem persists there when you open iPhoto for a while.
If the problem doesn't repeat itself there then try the following in your account:
1 - delete the iPhoto preference file, com.apple.iPhoto.plist, that resides in your
     User/Home/Library/ Preferences folder.
2 - delete the contents the following folder:
User/Library/Containers/com.apple.iPhoto
3 - reboot, launch iPhoto and try again.
NOTE: For Mavericks, 10.9,  go to your Home folder and use the View ➙ Show View Options menu to bring the this window:
where you can check the Show Library Folder checkbox.