General :: HTC Inspire Frozen On HBoot?

I've had an HTC Inspire for about 8 months now, with very little problems except the occasional frustrating frozen screen or two. A few months ago, I noticed that my "volume down" button wasn't working, so I would just manually change the volume through my settings. It wasn't a big deal, just irritating.

Last night, my phone was working just fine. I even remember waking up in the middle of the night and answering my texts.

This morning, I noticed it was turned off, so I attempted to turn it on, and it wouldn't work. Thinking it was dead, I plugged it in, got the "charging" screen, and attempted to turn it on again.

I got sent to the hboot screen. Unfortunately, it is not responding to the buttons being pressed. I've never rooted my phone, so I'm pretty sure this is all due to my volume down being stuck (and therefore hard resetting when I press "power.")

Is this fixable to the extreme novice (which I'm assuming it isn't)? Or, if as an AT&T customer, will they give me a replacement, or is this beyond their realm? I know when I lost my battery cover once, they wouldn't give me a new one and said I had to go to HTC.