Quicktime records a green screen
Solution 1:
Try the following:
- Turn off computer
- Reboot Mac into Recovery (press and hold Command+R when you hear the chimes until a screen loads)
- Select "Disk Utility"
- Select your "Macintosh HD" volume on the left and press "Repair Disk Permissions"
- Once that has finished, reboot your computer
If this doesn't work, call Apple Support