Background of the question:
My PC no longer POSTs; no sounds and lights appear at all (I.e., no reaction whatsoever after pressing the power button).
I want to isolate the component that is likely to cause the failure (most likely PSU because my PC would only wake ~5% of the time from sleep in the last 2 months, the PSU is >7years old, and is from merely a moderately reliable vendor).
CPU, Motherboard and RAM are very unlikely (they never made a sign of degradation, aren't overclocked, and come from the most reliable consumer vendors).
In this question, I would like to exclude the GPU and GPU drivers (the issue happened after updating the graphics driver, but the failure is likely independent) from consideration.
My main questions that allow me to exclude the GPU and the GPU driver from the overall problem:
Does the boot start of a PC (POST) use:
A. the discrete GPU to render the black-and-white text? or
B. the graphics processor included on the Intel CPU? or is
C. another processor used for the rendering of the POST text (the actual CPU or a motherboard chip)?
This is assuming that the BIOS has been previously set to use the discrete GPU over the Intel CPU on-chip-GPU.
If the answer to Q1 is A, does the graphics driver installed on the boot disk have any effect on the functionality of POST?