Your computer will not boot, it will probably freeze.
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What happens if you fear a boot. FEAR + BOOT = BAREFOOT.
When you don't have any operating system, the computer won't boot. You can only access BIOS setup or your boot-loader. In simple words, you can't do anything with it.
There is no way. Since there are no extraneous or third-parties in an Apple device, there aren't many parts to the sequence.
The computer starts but will not do anything useful. The Operating System is what creates any user interface. when you start up your PC in your BIOS there is a boot sequence normally it will check for something to boot from out of the HD first (in some cases it will look at the floppy drive first...usually on really old machines) if it doesn't find anything in the Hard Drive(aka your OS) it will follow the boot sequence until it finds something to boot from if it doesn't find anything to boot from (such as a live CD) then it will display something along the lines of "error: boot device not found"...i hope that answers your question (by the way you can change the boot seq in your BIOs if you were thinking about installing a new OS)
Most operating systems uses the boot partition to boot the computer. In some operating systems, both the system partition and the boot partition are used to boot up the system.