One or both of two things happened when it hit the floor:

(1) the hard drive sled jerked forward and CUT one or more of the display cable wires. Look VERY closely to spot this.

(2) the glass nipple broke off the display tube. This nipple is normally located immediately adjacent to the rotary controller (knob) assembly.

Have a look and see which it is. I can sell you a working displayboard in trade for your broken one and suitable cash, once we know which of the two possibilities applies.

EDIT: Ooops.. I recently added button/knob LEDs to my last displayboard here, so I don't have one to swap any more. Can still do the repair just fine, though, as I've done in the past for many others.

Cheers