You should listen to me. No, seriously, listen to me.
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Re: Dropped bike no start
The noise could be several things but the loudest is the fuel pump priming for a couple seconds. It's associated with the ECM getting power, which is a good thing. You haven't mentioned the year. Get a service manual. There should be a drawing titled "Starting System Diagram" or "STARTER SYSTEM AND SIDE-STAND/IGNITION INTERLOCK SYSTEM", which is fairly easy to follow. Note that the ECM isn't involved with cranking. It's just switches, fuses, the interlock relay, and the starter solenoid. Power to the ECM means that things are OK through the kill switch. The most likely culprit is the clutch switch, particularly since you went down on the left side.
Note that I'm assuming that your battery is OK and your wiring wasn't damaged.