I Mac(OS 10.6.5) Core Audio MIDI doesn't work

I just bought iMac. Problem is Core Audio/MIDI doesn't work at all.
I installed Logic Studio, Battery..but none of them working with MIDI interface.
When I worked with Macbook(OS 10.5) before, there was no problem at all.
I Used Mbox2 for audio interface and mic pre, and master keyboard with USB port as MIDI device.
Now I can't work at all with my music project because of audio/MIDI problem.
I tried to fix it opening Audio MIDI setup but I only get the message saying..
"Required Software extensions are missing"
and when I go to the the page after clicking OK, then it says that I need to get supported by software company for upgrade, which I have the latest version...
also I get the message "Core MIDI quits unexpectedly...".
These two message pop up every time I open Logic Studio too.
I hope solution for this matter.
I really need to focus on producing my music...

So, after long work around which failed this is how i made it work!
I think the problem is the latest update of the system (10.6.5) I am back now on 10.6.2 and all is fine : this is how i managed it based on the fact that the whole thing was working fine on my MBP.
1. download a copy of SuperDuper from the net
2.Open MBP and then firewire Target mode the iMac to the MBP
3. with the SuperDuper clone the Hard disk of the MBP to the iMac
This will erase all on your iMac and make its hard disc exactly the same as the MBP; it also makes it bootable.
4.open iMac alone
5. insert the original system dvd for the iMac and install the SnowLeopard system BUT DO NOT UPGRADE
6.restart as demanded and you should be on 10.6.2
with your desktop and hard disk running exactly as it was on your MBP
7 when opening Logic (or the other pro apps like FCStudio pro then you will be asked for your serial numbers which it duly accepts
8. all then should be running fine
Total time depends on size of your MBP hard disk (for me it took c. 3 hours including the reinstall 10.6.2) but all is now as it should be

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