Once your in the BIOS setup, the Boot Sequence is usually under the section "CMOS Setup" but the wording of the section can differ. Use the up/down arrow keys to highlight the section and press enter.
Once your in the CMOS setup, look for something like "Boot Sequence" or "1st Boot Device", "2nd Boot Device", etc.. and set the first to A the second to C and the third to the CDRom drive. Once your done press the ESC key. You should be prompted to Save the changes. Be sure you save the changes.
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