My Mac Pro setting I used this setting for 1-2 year without any problem. Now the system have the problem shown below: (cause in Lion , Lion Recovery , Snow Leopard DVD) 1. Main Screen Freeze in Boot Screen , Second Screen show Login Screen and I can use it in second monitor or Sharing Screen 2. TWO monitor no signal, I can use sharing Screen remote computer 3. Remove 8800GT, plug 73GT in Slot 1 , only Port 1 have signal, port 2 can detect second monitor but can't see anything 4. Remove 7300GT , plug 8800GT only, Freeze at boot screen in Port 1 , Port 2 No Signal, Can use Share Screen remote the Mac 5. Work without any problem for very short time now. Is the graphic card/s problem? I tried to remove / change the Ram, Hard Drive and PCI-E Card.