cpu not cooling down

Hi everyone, today I built a PC and I immediately noticed that the CPU is not cooling. On the desktop it is around 80 degrees but while I play it drops to 65 or 70 degrees. It is a ryzen 7 5800x with an arctic 36 as a heatsink. As a power supply I have an nxzt c750 80 plus gold. I tried to...

A couple of days ago I turned on my pc and I encountered an error which said "usb device over current status detected". I, then, unplugged the front panel usb connectors from the mobo and it started but I couldn't receive video signal. At that point I changed the position of the ram sticks and...