Golden Rivet,
Thank you for the excellent response. Is this from an MEL or from a troubleshooting/operations guide of some sort? Don't have the MEL with me (ships library), but recall similar procedures for dealing with one FMC inop. Also, could you post the guidelines for our situation, both FMC's (placarded) inop.
My main point is that to accomplish the appropriate procedures for FMC failure, the FMC must recognize that it has, in fact, failed (Fail light on). Normally equipement of this type is either working or not, but if it was operating in some degraded fashion (eg. lock up), I think it would be difficult to follow some of the procedures for FMC/FMC's inop while the FMC is still powered and believes it is functioning properly (no fail light).