I was going to post exactly the same thing.
I almost dropped my RVF400 onto it's left side some years back, then spent a frantic hour trying everything (sidestand switch, bump starting, working through the alarm/immobiliser possibilities etc).
I must've knocked the kill switch ever so slightly whilst grappling with the bars to not let her fall over; the switch LOOKED like it was fully "on" but it was not quite flat against the stop - obviously just enough to prevent any ignition and enhance my embarrassment.
After rocking the switch to fully off, on, off then on again,
the magic happened and the V4 came back to life.
Needless to say, I felt very silly. Just as well no one was around!
So, after all that, I hope it's that simple. It didn't occur to me initially to look for things on the right side of the bike 'cos the drop was to the left.
If it's not
then I'm sure one of our esteemed experts in the .org will be able to explore other possibilities.
p.s. Separate issue: Can you imagine me, 6ft5in, riding an RVF400? I never needed to lock it, I could just pick it up & put it in my pocket after arriving at my destination...