Macbook pro 13 inch i7 2nd generation wont turn on
I plugged in an USB Hard Drive and inmediatly prompted an error message and shut down my laptop in less than 1 second after the message. Now it wont turn on. Battery is charged to full (battery led meter works) and the magsafe adapters led is green while connected. Tried reseting SMC and NVRAM/PRAM without any succes. Also disconected the baterry for 15 minutes, nothing. Removed the memory cards without any changes.
I would apreciate any help since we are on easter week and theres no tech support available for me.
MacBook Pro, OS X Mountain Lion (10.8)