Normally when OS X boots you see gray and blue screens rather than the output of the system's load process. To see this process you need to manually invoke verbose mode. Topher Kessler MacFixIt Editor ...

If you have multiple operating systems installed on your computer, or if you are trying to boot off various utility or other boot disks, you may run into problems where using an alternative or desired ...

OS X is resilient. Its UNIX underpinnings are mature, tested, and — more importantly — stable. It’s a modern OS that’s as flexible as it is powerful, limited only by the end users operating the system ...