I am building my first computer with my dad and he knows more about this than I do.
In: Technology
When a computer starts up, it has a few simple steps that it performs automatically, no matter what, without any programming. Those steps are basically, 1. Find a disk, 2. Run whatever is on the disk.
On a computer with an operating system already installed, in step 1, the computer finds the internal disk.
On a computer with no operating system installed, you have to provide the disk. That will be in the form of a CD, DVD or thumb drive. You put that disk in, then turn on the computer. The computer will find that disk, and run whatever is on it. Assuming you put the right stuff on that disk, the program on that disk will write an operating system to the internal hard drive of the computer, so the next time the computer reboots, it will load the operating system from the internal disk.
the short answer is that there’s already something on the computer. the motherboard has a program called BIOS that does really low level stuff (like load the OS from the drive). An installer for the OS is on a disk or flash drive and the BIOS will load that if there isn’t an operating system installed already.
If you are buying a computer completely put together, it should come with an OS. Otherwise,,, the OS should come with a disk or if you buy it online might be able to put it on a thumb drive. The computer should read it and start the process so you can install the OS.
You download an installing software of an OS on a usb, plug it in the new pc, and boot the pc.
r/buildapc might know better.
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