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Model A1286. Released February 2011 / 2.0, 2.2, or 2.3 GHz Quad-core Intel Core i7 Processor

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MacBook Pro 2011 15" won't turn on, sleeping light flashes once.

My Macbook Pro won't turn on since I tried to use a mini display to HDMI adapter. Now when I press the power button, I hear the hardisk and the sleeping light flashes one time, and if I wait 3 minutes, the screen is white for 10 seconds, and the Macbook reboot; When I close the Macbook powered up the sleeping light stays turned on.

If someone can help me because I use this Macbook for my studies.

Thank you!

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Problem fixed! I pressed Cmd+option+P+R during 5 seconds at the boot, i heared the mac song and problem solved!

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Leonard Bert will be eternally grateful.
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