Now that you have a Tails device, you can shutdown your computer and start using Tails without altering your existing operating system.
If Tails starts successfully, the Tails boot menu appears:
Put the Tails DVD into the CD/DVD drive and restart the computer. You should see the Tails boot menu.
Shutdown the computer, plug your device, and start the computer. You should see the Tails boot menu.
If your computer does not automatically do so, you might need to edit the BIOS settings. Restart your computer, and watch for a message telling you which key to press to enter the BIOS setup. It will usually be one of F1, F2, Del, Esc or F10. Press this key while your computer is booting to edit your BIOS settings.
If you have problems accessing the BIOS, try to read pendrivelinux.com: How to Access BIOS.
You need to edit the Boot Order. Depending on your computer you should see an entry for removable drive or USB media. Move this to the top of the list to force the computer to attempt to start from your device before starting from the internal hard disk. Save your changes and continue.
For more detailed instruction on how to boot from USB you can read About.com: How To Boot your Computer from a Bootable USB Device.
If changing the boot order is not enough, you can also try the following BIOS configurations. Try restarting after each change, as each one might solve your problem.
Disable Fast boot and Secure boot.
If the computer is configured to start with legacy BIOS, try to configure it to start with UEFI. Else, if the computer is configured to start with UEFI, try to configure it to start with legacy BIOS. Try any of the following options if available:
- Enable Legacy mode
- Enable CSM boot
- Disable UEFI
You might have to undo these changes to start your usual operating system again after your Tails session.
You can also try to upgrade your BIOS version. Your computer vendor probably has instructions on how to do that on their website.
Shutdown the computer, plug your device, start the computer, and immediately press-and-hold Option until a boot menu appears. In that boot menu, choose the entry that reads and looks like a USB stick.
Then you should see the Tails boot menu.
If this does not work, then you might need to install rEFInd.
This could cause your Mac to not boot. It is recommended to create a full backup and know how to restore. See Apple's instructions.
Read our specific reporting guidelines when Tails does not start.