Sigh. So I get online with HP to try and figure out the specs for the hard drive so that I can get online and buy one, hoping it's not prohibitively expensive.
And guess what. Kettering bought the machine 2 years, 11 months, and 27 days ago. It's still under warranty until Friday. They're shipping me a new hard drive for free. And I didn't even have to ask them for it! They offered it freely.