Error initializing Informix-Online

In an old Informix Online 4.10 we have got this error: 1- The computer was turned off with INFORMIX running 2- After that, when I try to initializing Informix Online to quiescent mode tbinit answer: 'tbinit: fatal error in shared memory initialization' Shared memory not initialized 3- the system log file says: INFORMIX-Online Initialized -- Shared memory Initialized Physical Recovery Started Checkpoint completed Physical Recovery Complete: 0 Pages Restored Transaction Not Found Log Record: log = 3007, pos = 4b018, type = 51, trans = 2 Cannot Rollforward from Checkpoint INFORMIX-Online Stopped 4- That's all. What can I do? My only idea is to reinstall INFORMIX-Online and recover the databases from a backup ( and old one :-( ) Any other suggestion? Thanks in advance.