Tried opening my Mac in safe mode SMS mode. And pram mode. It acts like it is going to start up the gets about 10 percent through the grey start up box and then suts down

Tried opening my Mac in safe mode SMS mode. And pram mode. It acts like it is going to start up the gets about 10 percent through the grey start up box and then shuts down. Any other thoughts?  Thanks

Douglaslouis,
which model Mac do you have, and which version of OS X is installed on it?

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