If you’ve got BootCamp installed and have it defaulting to boot into Windows then remove the Windows partion you’re going to get a “No bootable disk found” screen everytime you boot up.
I still don’t know why OSX isn’t smart enough to handle this issue with more grace but that’s another post altogether.
To resolve this just follow these steps:
- Restart your computer and hold down the Option key until disk icons appear onscreen.
- Select the startup disk with the operating system you want to use (safe bet that it's going to be OSX), and then click the arrow beneath the icon.
- Once OSX is launched, go to System Preferences, and select the OSX volume as the startup disk. </ol> Once you've completed these steps you'll be able to reboot back into OSX without the annoying screen.