DOES happen. By CPU do you mean the Computer? The CPU is a little 2 square inch chip with the heat sink and fan on it.
Some mobo,s hide the bootscreen behing its logo display. With most of them one must hit the tab key IMMEDIATELY to see the boot screen instead of the LOGO screen.
My brother CPU is sucks...it's boot screen never did showed up even in Safe Mode. Everytime it keeps restarting. The HD never become a problems at all coz I have tried it in another CPU and it works perfectly! Can somebody help me???