[kubuntu] Installation successful, doesn't boot after restart!

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http://ubuntuforums.org – I used a usb stick with the installation iso image to install unbuntu on my older Dell tower. The model is Precision 380 — it was being used as server, and before I got it, it didn't have an OS installed. It has a couple of Seagate Barracudas HDs in it. During the installation, I had to choose one or the other. After the installation was successful, I restarted the computer and changed the boot priority from usb to "Serial ATA" I believe it was called. There are limited boot options. Basically, just the cd-rom, the usb, or the serial ata, so I am pretty sure I picked the right on (Hardware)