

Google searches for " install Mac OS from bootable drive" turn up nothing about the actual installation. When I do connect, I click try again and then a fail prompt comes up saying "A required download is missing".

When I go back to the menu, and click "Reinstall OS X", I get a prompt saying "OS X can't be installed because you aren't connected to the internet". When I turn on my iMac 2011, it takes me straight to the Recovery screen (because I previously Erased the main drive). However, now that I have the Bootable drive containing Mac OS El Capitan, I cannot find good information on how to actually install from it. Then the system will launch from that device every time.I asked earlier about how to create a Bootable drive for the purpose of installing Mac OS on an older machine, and I received a great answer (thanks to Anderson). unless you keep the boot media in the USB port. That won't be a problem since the BIOS will move to the next device in the boot sequence. In the future, your computer will first check the USB port for boot media when starting up. If you do nothing, your computer will go to the next device in the boot sequence list, which will likely be your hard drive. Stay alert! Depending on your BIOS, you may be prompted with a message to "Press any key to boot from an external device", and you will only have a few seconds to respond.The computer will reboot using the new settings, booting from your USB drive.Save the change and then exit the BIOS Setup.In that case, you'll need to: Move Hard Drive Devices to the top, Expand to show all hard drive device options, Move the USB device to the top of that hard drive list.

NOTE: If you cannot find USB or Removable Devices among the device options, your BIOS may list it under Hard Drive Devices.
