My laptop won't boot form external USB DVD drive

Hi, I have HP pavillion dv6748us. My internal dvd drive is not recognized, cannot access and not listed in device manager & window explorer. I need to reboot from the external dvd but don't see the option listed in BIOS. Below is the sequence listed in my BIOS. I have recovery disk and would like to know if and how to add external USB DVD DRIVE into to BIOS.
Your help is greatly appreicated!
(1) ATAPI CD/DVD ROM DRIVE
(2) USB HARD DRIVE
(3) NOTEBOOK HARD DRIVE
(4) USB DISKETTE ON KEY
(5) USB FLOPPY
(6) NETWORK ADAPTOR

Have you tried 2? The BIOS may see the DVD drive as a mass storage device and not distinguish between a hard drive and an optical drive.

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Quote from: cadhopper on 24-March-11, 07:19:08
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I have replace my superdrive by a SSD disk and re instal Lion on it I steel got my orginal hard drive and I use it to save all my documents ... From here everythings it's ok but ...
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My laptop won't boot form external USB DVD drive

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