The POST runs
Download cpu-z or it might have it somewhere in the bios.
The CPU depends on the BIOS to fetch instructions for processing and then to present it to the user after it is processed, The BIOS also depends on the CPU to process the information it fetches and sends back.
BIOS of what component? your graphics card will have a BIOS, the CPU will have a BIOS. If there is nothing wrong with yours don't bother replacing it.
Most motherboards only support a specific subset of CPU's. If you change your CPU you MAY need to replace the motherboard... but if you do that it will include the appropriate BIOS. You may also need to re-install the Operating System.
BIOS is activated by powering on the CPU
The BIOS on the motherboard.
bios & cpu
jumper that set the cpu speed or reset the BIOS memory
The BIOS is activated by powering on the CPU
What happens is that when you press the power button it sends an electronic signal to the motherboard, the motherboard is designed to start the power-up routine when this signal is received so first it activates, then the BIOS becomes active and starts the various components of your computer. Once everything is started is displays the BIOS screen and then the Hard Drive is spun up and windows starts loading.
The only reliable way to overclock your system is to change the settings in your computer's BIOS. The BIOS (sometimes referred to as UEFI) contains your PC's key settings. To access the BIOS, you must turn off your computer and turn it back on. As the computer restarts, press the DELETE, F2, or F10 key repeatedly.
IRQ