I tried to power up my MB Pro yesterday and got the usual start up screen displaying the apple logo and the indicator that the start up process was proceeding.  After 5 minutes, the logo disappears with a grey circle with line thru it and nothing.  ???

I tried to power up my MacBook Pro yesterday and got the suual grey screen, Apple logo, and the start up indicator circling gear.  After 5 minutes of this, the logo disappears replaced with a grey circle with a line thru it.  This is the first time this has happened. 

hi Melophage,
     Please Help!!!! https://discussions.apple.com/message/25645888#25645888

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