Boot into OSX by holding down the Option key at startup. Go to System Preferences and click on Start Up Disk. Choose your OSX volume as the default. Then your computer will boot into OSX when you power it up.
Boot into OSX by holding down the Option key at startup. Go to System Preferences and click on Start Up Disk. Choose your OSX volume as the default. Then your computer will boot into OSX when you power it up.