Cannot Boot From USB Hard Drive

[Undead Surfer]

As my specs in my signature show, my motherboard is the P6N Diamond.

My retail installation sits on a SATA hard drive. I never been able to get my IDE to work whatsoever.

Recently, I've been trying to do an installation on an external USB drive. This is a USB hard drive enclosure with an IDE hard drive inside of it.

The installation is usually successful but when I try to boot from the USB drive, I get a:-

"Still waiting for root device".

Anyone have any insight into why I can't boot from the USB drive?