HT201314: About OS X Recovery
Learn about About OS X Recovery
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Helpful answers
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Jun 3, 2015 9:24 AM in response to tonylam63by rkaufmann87,Likely a failed HD. When posting please post specifics, telling us "now i cannot boot using any key combo" tells us nothing.
Run Apple's Hardware Test in extended mode 2-3 times back to back, if errors appear take the machine to your local Apple Authorized Service Provider. If you don't know where one is, please click https://locate.apple.com/country to locate one in your general area.