How do "fundamentally unstable" aircraft deal with the risk of computer failure? As technology becomes more advance airplanes are becoming less and less stable.  In flight school I learned that it's dangerous to load a Cessna out of it's CG range, and now in college (for aerospace engineering) I'm learning about modern fighters and their fundamentally unstable designs.  

A lot of these unstable aircraft are supermaneuverable but rely on computers to fly them more than the human pilot in the cockpit.  

I'm sure that these airplanes are thoroughly checked before every flight to make sure the computer systems will perform accordingly, but in the event of a failure what kind of side affects might a pilot experience?

The two conditions I can think of are


No computer aid, but the control surfaces are still "responsive"
The pilot loses all control of the aircraft and none of the inputs work.
"fundamentally unstable" but über-responsive aircraft have multiple computers that take a vote on everything the pilot wants to do. If one computer fails the others will take over. There is often no direct connection between the control column and the flight surfaces so the "no computer aid" situation would be the same as #2.

If everything fails, the checklist is rather short: eject immediately.