Cara:
Try this:
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the third time.
6. Release the keys after third chime and immediately hold down "Shift" key to allow compupter to
start up in Safe Mode.
7. Log in.
8. Go to Applications > Utilities > Disk Utility and launch Disk Utility
9. Repair Disk Permissions:
Select your HDD (manufacturer ID) in left column and First Aid in main column.
Click Repair Disk Permissions at bottom left.
10. Restart computer normally and log in.
If you run into any difficulties in completing this procedure, please note exactly what happens and at what point.
Good luck.
cornelius