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. Once you've completed these steps you'll be able to reboot back into OSX without the annoying screen.