I've had some major problems with my 2012 Macbook Pro but I'm slowly getting it to work. One of the problems is the Mavericks OS wasn't loading so I tried a restore that didn't work and then I tried to reinstall it but it doesn't reinstall. It asked me if I want to format the partition so I reformated the partition and tried again but nothing. Then after it restarted it goes straight to Win7 Bootcamp. Holding down the Option key, Option-R, SMC reset, etc. doesn't work either. In the Windows Bootcamp it only shows the Windows7 startup and not the Mac startup but If I go into windows explorer it shows the Mac Partition but I can't save or use the Mac partition. Basically when I turn on my Macbook pro I get the bong sound, no Apple logo and it loads up Windows 7. Any ideas?