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My screen is cracked so I can't see the boot picker. &nbsp;How can I see using boot picker or what do I press to select USB. &nbsp;
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My screen is cracked so I can't see the boot picker.  How can I see using boot picker or what do I press to select USB.  

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Can I boot from USB DVD drive. &nbsp;Do I hold down c at startup
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Can I boot from USB DVD drive.  Do I hold down c at startup

c at startup

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.

Mac OS X

Objective-C is an object-oriented programming language that is a strict superset of C (any valid C code is equally valid Objective-C code), and it inherits its object-oriented capabilities from Smalltalk. All procedural syntax is identical to that of C, and all object-oriented syntax is an implementation of Smalltalk messaging. It is the main programming language used by Apple for OS-X and iOS and their respective APIs/ Objective-C inherits the syntax, primitive types, and flow control statements of C and adds syntax for defining classes and methods.