Macbook keeps booting OSX Utilities instead of Mac OS X Here is my story I had a MacBook PRO 2010 with Mac OS X 10.8 Mountain Lion since I bought it I've never reinstalled the OS until  now. I did a clean install following this instructions http://www.hongkiat.com/blog/clean-install-mountain-lion/

Since then I've had reinstalled twice. Everything works fine for couple of days until I turn on my mac and this image comes up:



What I'm doing wrong why now keeps showing this window instead of booting to Mac OS X.

Any ideas?
I had the exact same problem and my IT guy told me to reset my NVRAM. 

Just hold down ⌘ CMD+⌥ OPT+p+r on restart and keep the keys held down until it  chimes 3-4 times. Then let go. 

Worked like a charm for me. I off to back up my data now.

Apple page about resetting NVRAM.