Thanks for the quick reply. 
Fortunately, I am not able to recreate the bug!
What I did:  
I erased both my hard drives 
installed fresh win7 on one,
installed fresh ubuntu11.04 64bit on the other,
installed video drivers in ubuntu ,
installed all updates in ubuntu,

problem seems to be gone because I cannot recreate it anymore.

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https://bugs.launchpad.net/bugs/721385

Title:
  Computer will not boot after shutdown or restart

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