Hey guys all help is appreciated. I build a new pc 1 month ago. Ryzen 5 5600x, msi x570 motherboard, gigabyte 3070ti gaming oc, xpg core reactor 850w. The pc ran fine till I decided to do some pbo undervolting. I had done it before I set it to -30 and my pc after saving bios and restarting didn't start. Everytime I start it it shows just a blank screen. Fans, cpu pump, gigabyte card led and the card gets hot. At first I tried reseting bios and clearing cmos that didn't work, the code that showed on the mb was the post light. My motherboard was under the 2 year replacement program so I replaced that still didn't work exactly same thing. After that I bought a new processor bcs I thought that went bad since I undervolted and that didn't fix it. I tried ram in all dims, didn't work so I tried another new ram, also same thing. I did the bios flash with both the cpu and gpu installed and not installed, same result. I also tried another gpu and that didn't work. Every part besides the power supply which I don't think it would fail from an undervolt I tried replacing. I'm losing hope, if you can help thank you!