Miriam, I'm not sure whether your post is tongue-in-cheek, but it sounds like the old Dan Air 727 Wx radar story modified for the A320.
If the FMCG failed, there is a procedure for pulling CBs detailed in FCOM 4. You would certainly not rerack the MCDU.
The FMGC is a computer in the avioics bay. The MCDU is the cockpit interface between it and serveral other systems (ACARS, AIDS, CFDS)
If the crew did try and rerack the MCDU, it is not in the path of the thrust levers.
The thrust levers do not move on the A320 in flight. Once climb thrust is set after T/O, the thrust levers remain in the climb detent until the retard call at 20ft.