How can I re-run the SMC and EFI driver updaters ?

When I bought my iMac Intel 20" in mid-2006, I immediately had a problem with the video driver when the computer woke up from sleep : the screen was badly flickering.
After lengthy talks with Apple, I was sent two updaters (one for the SMC and one for EFI) which solved the problem. Just to make sure, I deactivated completely the energy saver.
No problem for two years and a half.
Last night, for a reason unknown to me, the computer went into sleep mode and when it woke up, the whole screen was flickering and had vertical lines in it, despite having up-to-date SMC and EFI drivers.
Assuming that they had been corrupted, I wanted to re-run the updaters. But the computer refuses, saying that it is not needed.
So, my question is "HOW CAN I FORCE A RE-RUN" OF THE SMC AND EFI UPDATERS ?"
I have tried everything else, resetting the PRAM, resetting the SMC, tinkering with the monitor settings. But nothing works.
I believe that running again the updaters is the only possibility left, but they are up-to-date
Here is a summary of the iMac system info :
iMac (20-inch, Early 2006) IM41.0055.B08 (EFI 1.1) 1.1f5 (SMC 1.0).
Many thanks in advance for any suggestions
Patrice
PS : I have tried to contact the "experts" at Apple Support but, because my machine is two years old, they want me to buy time to ask this question from them, despite the fact that the problem stems clearly from a faulty design at the beginning of the iMac life, and that the knowledge base says that there is no unresolved issue presently with this model !
Well, the problem is still there after two years and I only avoided it by deactivating the energy saver.
But Apple never mentioned how to force running an updater if the machine does not want to ...

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