Hi all! I have decided to go with a fresh and clean install of OS X 10.11 El Capitan this time. As I've done a thousand times before I created an install-USB by downloading El Capitan from the App Store and compiled it on to the USB-drive by using Apples own terminal command. However, the install-USB is not bootable and does not show up i the "Startup disk preference panel". Is does mount as it should on my desktop, though, and I'm able to run the installer from the USB. But it's not bootable. Can't really see how I can do this procedure wrong. Heres what I've tried so far: - Redownloading El Capitan from the App Store (if something was wrong with the first image) - Tried creating the USB on three different Macs (with Mavericks, Yosemite and El Capitan) - Tried creating the USB by using Diskmaker X 5.0.1 instead of the terminal command (on three Macs) - Formatting the USB a thousand times (GUID / OS X - journaled) - Testing the USB on four different Macs - none of them recognizes the USB as bootable So what do you wise people say? Why can't I create a bootable OSX-install-USB like before? Thanks!