Cubase Se "unexpectedly Quits", After hours of normal usage Options

[korektphool]

Hi all Macmusicians,

My equipment: 2.5Ghz G5, Cubase SE (with Studiocase - bought from a real Steinberg dealer) and some otehr audio/midi devices.

I was using successfully Cubase for about 5 hours yesterday (and previous days it was working perfectly). Then, I saved my project and quit normally. When I opened up my project and the application about 10 minutes later, it would not work. I keep getting the message: Cubase has "unexpectedly quit" after teh opening box. This way, I cannot open any project.

I have tried many remedies for fixing this error:
1) I used MacJanitor to clean up my HD
2) uninstalled Cubase and Studiocase and tried installing again.
3) Deleting the preferences.

Still, the Cubase does not open and i am unable to make any music on my computer.

Anyone here, if you know what to do to fix this problem: please help.

Sorry if this is posted on the wrong section; I did not know whether to post it in the software section or the getiing started section.

Thanks
[KorektPhool]