Shut your computer down and remove the power cord.
Replace the power cord and press the "Power" button to restart it.
Watch the screen carefully for a message about computer setup.
Most computers use one of the function keys, which are aligned across the top of the keyboard, to access the computer's setup utility, but each manufacturer uses a different key.
For instance, HP computers generally use the F1 or F10 keys, while many Dell computers use the F12 key.
Press the appropriate function key to enter the computer's setup program, then scroll through the list of options until you see "Boot Order."
The exact location of the boot order option varies from manufacturer to manufacturer, but it is often located under the Advanced menu.
Highlight the "USB Devices" option and press the up arrow key until that device is first on the boot order list.
This will force the computer to look at the external DVD drive first when it boots up.
Use the "Esc" key to exit the setup menu. Choose the "Save settings and exit" option and allow the computer to reboot.
It will now boot from the external DVD drive. Hope this helps
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