I have an X570 Pro motherboard and a Ryzen 7 3700X, I wanted to use my old heatsink and fan so I took my old one off cleaned the CPU off with isopropyl alcohol then realized I don't have the backplate for my old cooler so I cleaned off the new thermal paste and reapplied some then put the old cooler on and went to plug my PC in. When I started my PC everything starts up even my CPU fan but my CPU fan stops after about 3 seconds and around my CPU doesn't feel hot at all. Did my CPU die on me? My theory is the fan isn't running cause there is no CPU temp it's reading but I'm not sure if that's exactly how it works. My GPU, hard drives, and SSD are all still running and my power button starts my PC up but won't shut my PC down even if I hold it for a long time. I don't make it to BIOS either. I took my Cmos battery out reset bios and now my CPU fan spins but the area around my CPU still feels cold. Any ideas?