It looks like the Mini is trying to boot from the last thing in the BIOS list; the network cable using the PXE protocol.
You can manually choose which device it boots from by tapping the '0' key before it boots. If you catch it in time, you'll be presented with a list of available boot devices. You can then manually select the USB option you've got access to.
Good luck - keep us posted!
Obsidian Mini 9 >
2gb ram, 16gb ssd, bluetooth, 1.3mp webcam, us-intl kbd Internal Mods >
usb hub, 16gb flash drive, 8gb flash drive, added webcam, changed kbd Software Mods >
Dellbuntu 8.04.1 | Gentoo 2008.0