41-Kernell Power

[cmacapayag_ph]

Hey there, first of all, english isn't my first language so please forgive my grammar. I am an amateur pc builder and I do PC cleaning services and hardware installation and windows installation for most of my clients, AKA, my friends and family, who are so supportive with me letting them fix their personal computers, had a few mishaps like, breaking my friends power supply, due to plugging in the 12volt RGB to a 3 Pin ARBG Pin. Breaking the motherboard pins on one of my friends intel motherboard because I tried to put so much force on his air cooler, bending one or 2 pins on his motherboard.  But all in all, I have at least a little knowledge when it comes to pc building. I had 2 of my friends encounter issues with black screen, when I asked them what the error is in Event Viewer.( I am also experiencing this error, random black screen, I think when our PCs are full load, that's the time it would shutdown?) All three of us had the same issue, 41-Kernell Power. I've tried everything in my power to diagnose the issue, I've watched a video on YouTube that might be the suspect of my issue, it was the PSU, first I tried to unplug, JFP1, HD Audio, USB 3.0. Tried replugging 24pin- 6 pin on my motherboard. He recommend I download, HWMonitor and I found something he said something about my 5volts, it was under 4.70vish and sometimes dips to 4.660v It said that maybe one of my cables aren't seated properly, or the power supply could be faulty, hence the unplugging. When I tried to replug the power cable for my HDD, it went back up to 5.80volts dippin down to 5.40volts, confident that it solved the issue, I thought I was able to fix the problem. Yesterday, had the same issue again, black screen restart without any error messages. Computer is fine and running but it's annoying to deal with. So wondering what else could I do. Could it be possible that I installed a faulty operating system for us three? Thanks for all your inputs and I am sorry for confusing you with my grammar.