Hi, so I got the gigabyte aorus B550 pro AX and the ryzen 5 3600 CPU with cooler. When I was installing the CPU I thought I might have put the fan on the wrong way so removed it and didn't know about the thermal paste. So do I have to replace the thermal paste or can I just install the fan like normal??( I'm a noob lmao and the PC has never been on so I was wondering if it's necessary to replace or if I can keep as is)