So, I know that you need to reinstall OS after replacing parts like motherboard. I replaced mine long time ago. I managed to do it somehow, I think it was some HP program I launched somehow. My version is preinstalled. I have this Recovery thing in my hard drive. Im not sure should I use it and should I launch it from bios or should I launch the HP factory reset/OS reinstall thing wich I dont remember how to. Any ideas?