A Flight 370 Conspiracy Theory Worthy of HN

What is the plane's computer systems were hacked?

Stay with me a moment. The 777 is a fly-by-wire airplane so an exploit could potentially take control of the plane. My understanding is that the computer can't shut off the transponder or radios (is this correct?) but what if the pilots were "told" to disconnect these systems or else the hacked flight computer would crash the plane. A short terrifying dive and I bet they would comply. It could then fly some remote airfield and demand the pilots land the plane.

C'mon it could work!