Tip - How to Boot From a CD or USB Drive on Any PC

Occasionally, if you're troubleshooting your PC or installing a new operating system, you'll have to "boot it from a disc" or USB flash drive. Here's what that means, and how to do it.
Tags: Emailable Tech Support, Live CDs, Windows, Mac, Mac OS X, Os X, Linux, CDs, DVDs, Flash Drives, Thumb Drives, USB, Bios, 101, Lifehacker