Hi all. Just wanted to follow up to say I figured out the issue. I did mention I'm a noob to Raspberry Pi, didn't I?
Well, it turns out the problem is that I was trying to read the image off of an SD card that I had inserted into a card reader connected to the Raspberry Pi by USB. It was only when talking to a friend the other day that I realized that the USB port was probably not functional until after the OS was loaded. So I ran out and picked up a microSD card, put the image on there, and it loaded up first try. Don't know why that didn't occur to me before. Anyway, thanks for everyone's support. Tomorrow I'm looking forward to actually playing around with the set-up, hooking it to my amp, etc. Thanks again!