the hard drive spins and clicks

Sounds like the impact has dislodged the IDE cable. This has happened to me twice simply because the bag that my empeg is kept in has been put down hard. (Which is why I keep an allen key and screwdriver in the bag). I'm guessing that if your display was working then you'd see the No Hard Disk message.
You display not working could be one of a few things. As Mark mentioned, cable fray is a possibility, although that would usually happen over a period where it is rubbing, and not a single jolt. I discount the possibility that the cable has popped off the mainboard because your LED and top button work. The most likely suspect is that the nipple on the VFD has broken and let all the magic smoke out. (Search the FAQ for a better description and photos).

So to recap, I think you have 2 problems.
1) IDE cable needs reseating. Do this and you should then hear music.
2) VFD broken. If this is the case then it's going to cost you some money unfortunately. I'd suggest that sourcing the VFD and then finding a local TV repair place or known competant soldering friend would save you a lot on shipping charges.