How to Force iMac to Boot EFI

Shut down your iMac from the Apple menu. If you are trying to reboot into a special mode because your iMac is locked up, shut down the computer by holding the power key for five seconds.
Press the power key briefly while holding down the Option key. This provides a list of available disks with bootable Mac systems. Click on an alternative startup disk to boot your Mac from that drive, such as an optical disc or an external drive.
Repeat Step 1 if this does not produce the desired result.
Hold down 'S' and press the power key to launch into single-user or 'safe' mode. This provides you with a Unix prompt and instructions you can use to repair your boot volumes. These commands perform similar repairs to what can be done within the Disk Utility application, but this process will allow you to repair an iMac that cannot be booted.
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How to buy an External DVD Burner for Macs (5 Steps)

Determine the speed you want. External DVD burners have different capabilities when it comes to the speed at which they burn DVDs. While the quickest burner sounds like the best option, you could be sacrificing other options.
Check your home DVD player to determine which types of DVDs it plays. Some home DVD players don't play either DVD-R or DVD+R disks. Purchase an external Mac DVD burner that will burn disks compatible with the players you plan to use them in.
Buy a Mac external DVD burner that can also play DVDs, if you have an older model Mac that does not support playing DVDs. A Pioneer mechanism in many newer Mac external DVD burners allow you to play DVDs produced by movie companies. Certain DVD burners like CD CyClone's DVD Revo don't support this feature.
Purchase an external DVD burner like the ClubMac FireWire for your Mac laptop computer that uses your laptop battery as a power supply for ultra portability. One downside of Mac units that don't use external power supplies is they tend to have loud cooling fans.
Pick a design that fits your needs. Mac external DVD burner cases come in styles that are barely larger than the drive itself to elaborate and colorful designs. The QPS Que Fire DVDBurner Pro has a small design for portability. Other drives are larger for desktop Mac computers.
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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 Create a Disk Image in Mac OSX (6 Steps)

Insert the disk to convert into the disk drive. Wait for the computer to identify the disk, and add an icon for it on the desktop.
Double click the Macintosh HD (or main hard drive) icon. Select 'Applications' and finally double click 'Disk Utility' under 'Applications.'
Select the disk from the list of hard drive(s) and disks on the left. There should be a small disk icon and then the name of the disk; it appears under a small disk icon with the name of the CD/DVD drive.
Choose 'New Image' from the icons at the top of the window once the disk name is highlighted. It should appear as a drive icon within a page icon with a green and white plus sing in the top right corner.
Create a .CDR file by choosing 'DVD/CD Master' from the Image Format selections. Give the file the desired name in the 'Save As:' panel. Any other selection will create a .DMG file.
Convert a .CDR file to an .ISO file simply by clicking on the file name twice (not double clicking) so that the name is highlighted with a cursor. Erase CDR, and type 'ISO.' Press 'Enter,' and the file is ready for use by Windows-based computers.
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