How to Reboot an Apple iMac to Its Factory Settings

Verify that your iMac is connected to the Internet, click the Apple menu in the upper-left corner of your screen, and then select 'Restart.'
Press and hold 'Command-R' when the iMac gets to the gray screen during the restart process.
Select 'Disk Utility,' and then click 'Continue.'
Click your hard drive on the list of hard disks, and then click the 'Erase' tab.
Click the 'Format' pop-up menu and select 'Mac OS Extended (Journaled).'
Enter a name for your hard drive, and then click 'Erase' to erase its contents. The name you enter is what your hard drive will be called after the reformatting process is complete.
Click 'Disk Utility,' and then click 'Quit Disk Utility' once the hard drive has been erased.
Select 'Reinstall OS X,' and then click 'Continue.'
Follow the on-screen prompts and, when you arrive at the Disk Selection pane, select the hard disk you named in Step 7.
Click 'Install' to reinstall the OS X operating system.
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How to Boot a Mac With an External Hard Drive

Connect the external drive to the computer you wish to boot. If the drive requires an external power source, make sure the power is connected and that the drive turned on. It is best to attach a USB drive directly to the computer, not through a USB hub.
Eject any CD or DVD that may be in either drive. The key combination you will use later is also applicable for booting from a CD or DVD.
Turn on or restart your computer. To restart a computer that is already on, press the power button once to enter the shut down-sleep-restart menu. You can also press 'Control + Command + Power' to restart unconditionally. The 'Command' key may be marked with a four-tipped curlicue figure, an apple or both. The 'Control' key may be marked with an upward pointing caret.
Press the key combination 'Control + Shift + Option + Delete' and hold it down while the computer starts up. The 'Option' key is usually marked with a diacritic that contains a diagonal line with a dash above it. The key might also be labeled 'Alt.' This key combination will force the computer to ignore the normal startup disk, which is usually an internal hard drive. The computer will instead boot from any attached bootable devices, such as an external drive or CD.
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How Do I Get the Waiting Icon Off of My iPad?

Press and hold the 'Off' button.
Press and hold the 'Home' button.
Release both buttons when the Apple logo appears on the iPad screen. The iPad should restart without the 'Waiting' icon.
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