Sami

ahh classic repasting helps if the paste is old and dry, but use a thin, even layer and tighten the cooler in a cross pattern so pressure is even.

yeahhh if the HD audio device shows a yellow mark, uninstall it in Device Manager (tick delete teh driver software if offered), then reinstall teh GPU package with the audio component selected.

oh ive been there lol honestly just reset the BIOS and save yourself teh pain

After switching, Device Manager should show Standard SATA AHCI Controller or Standard NVM Express Controller :) The RST/RAID driver can stay installed; it just won't be used. You can remove it later via Apps or pnputil if you want.