Can/how can I fix my broken Tivo

I have a a Sony SVR2000 (first generation Tivo, that is) with lifetime service. It also has a cache card It had a battle with gravity, and gravity won. It won't turn on. I tried all the obvious things (like plugging and unplugging it), with no love. I suspect it's a broken hard drive, especially since the guy who fixed it so that it would talk to the cache card didn't secure the hard drive to the frame afterwards.



I probably have a copy of the hard drive from when the cache card was installed, though I'm not 100% sure where it is.



I am... not the most tech savvy person in the world. So, can someone give me the for-dummies version of what I need to do at this point? (including, for example, "buy this thing, then have a tech-savvy person install it for you" or whatever)