Windows Boot : goes into black screen and no bios, freezes.

Cmos battery? If so I've done it over, no change

standard procedure for a machine that won't show anything at all on the screen is to remove all devices except keyboard, mouse, and monitor (using a different monitor if you have one), and seeing if you can POST. If not, go down to one memory dimm, also try a different power supply, remove video card and go with onboard video if you have it. If you have both a vga and an hdmi port try both. If all of that produces no POST and you now have to just guess what failed, your symptoms imo point to a failing motherboard or power supply.

I used to have CPU usage spiking up to 100 quite often. I'll try to get anothrr power supply to test it whether the psu died or not.

I've tested onboard graphic before and didn't help. My psu power 28 pin or 26 pin that plugs into the motherboard is incredibly tight. Are manufacturers allow to glue stuck the psu cord? I can't get it to move 😐😐😐😐😐😐😐

when you can't get it to move it usually is because of the "lock" clip thing is stopping it

I press the clip, pull up, the motherboard starts to bend upwards with the force.🤔

on mine I can't even disengage the clip by pressing it, have to pry it away. Its insane. They make them way too thick now.

Great idea. Prying my plug now