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The power button is on the back of the LCD screen in the lower left hand corner. You should power down by clicking on the Apple Logo in the upper left hand front corner and choose "Shut Down". If your screen freezes, you can power off by pushing the power button and holding it.
Restart in safe mode by holding the shift key strait after the chime untill the apple logo apears. You will have to log in with password. then open **** utillities and repair disk permissions. reboot and it should come back as normal
To add the hard disk icon back onto your desktop, first click the "Finder" button in the dock. It is the dark and light smily face icon at the end of the dock.
Next, click the "Finder" menu item at the top of the screen and then "Preferences". In the "Finder Preferences" window that opens, click the "General" button. From there you can select what system items appear on your desktop. You can click "Hard disks" to re-add the hard disk icon.