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Please go to the Apple logo at the upper left of your computer screen to About This Mac and give me this information:
To start with we need to check some things:
Reboot into the Recovery HD by choosing the ‘Apple‘ menu > Restart, then hold down the ‘Command’ + R’ keys on the keyboard during the start up process. If you can't get to that menu just hold the power button for 10 seconds until it shuts down. Then start it up again holding those keys. When you see the Apple Logo you can let go.
When the machine boots you may have to choose your language then you will see the OS X Utilities screen. Select the Disk Utility and then select Continue. Then in Disk Utility select Macintosh HD in the left column (if there are two with that name or it is named something else choose the first indented item) select the First Aid tab if it is not already selected, then click on Verify Disk on the far right. If that says “OK” in green type then select Repair Disk Permissions. If it is not ok let me know.
No it will not reset anything it is just checking your hard drive and permissions
I can help you by remote if you can wait a few minutes
OK then it can be a little more difficult. Give me a minute to get the instructions together
Do you have more than one hard drive? Is your iPhoto Library stored in your Home folder in Pictures? Do you have m ore than one iPhoto Library? Is there any reason you are not using the newer Photos app that replaced iPhoto?
That is why it is easier if I can see your computer are you sure you don't want to do that?
OK then it is not easy for me try quitting iPhoto then hold Option and open iPhoto do you see more than one Library listed?
And it is empty?
OK quit iPhoto open Terminal in Applications / Utilities copy and past this line at the command prompt then hit Return:rm ~/Library/Preferences/com.apple.iPhoto.plist
Then hold down the Option or ALT (if outside the USA) and Command keys and start iPhoto. Check all the boxes and run Rebuild. Or if you don't have boxes just select Rebuild the Database
Sorry I just noticed you said your computer was out of space how did you fix that problem?
OK in that case I really need to see your computer to help you. Since you don't want to do that I'm opting out. Good luck...
Can you clarify some information for me, please. Did the photos in iPhoto vanish immediately after the last import?