Which part of computer send instructions to CPU when the computer is turned on?

Answer 1

The CPU fetches instructions starting at a default address which is in the firmware (flash BIOS) of the computer. The BIOS has the instructions that allows the operating system to be loaded from the hard drive.

Much more at
http://en.wikipedia.org/wiki/BIOS

That was assuming you were asking about a PC. Computers in embedded systems, like the ones that control the engine in your car or control your cell phone, have the entire program in flash or ROM.
http://en.wikipedia.org/wiki/Embedded_system#Examples_of_embedded_systems
http://en.wikipedia.org/wiki/Engine_Control_Unit#ECU_.27flashing.27

Answer 2

The BIOS ( Basic Input Output System) . The BIOS contains the lowest level of software in a PC that instructs the CPU on where to find the OS and load it into RAM

Answer 3

a processor is a bunch of digital switches arranged so as that they are in a position to be set to do math. this processing, of math gets better to a scale the place those and zeroes mean get translated into suggestions this is usable. there are various types whether the buyer marketplace loves to categorize them via style of cores (bunches of specific switches to deal with an entire set of mathematical applications). a single middle can do one job at a time. twin cores do 2, quad cores do 4 etc etc. the makes use of of a processor are to regulate each and every of the suggestions. think of that a working laptop or laptop is nearly a individual doing math paintings on a table. the sheets of paper stacked up are the storage, the paper proper in front of the guy and the guy who certainly does the paintings is the processor. via doing little initiatives in a definite order adequate situations, you're able to do fairly complicated stuff. whilst a processor gets broken, (adequate to be observed) this is going to quit to paintings all jointly. considering the fact that each and every of the little switches are used generally and maximum rely on the right output of previous switches, a failure of one little swap will make a failure down each and every next swap until the perfect values of the specific job is carefully incorrect. i can't make it easier than that whether the different solutions are great with info.

Answer 4

BIOs