Whining/droning noise

Hi!

I started in Safe Mode and I don't hear the noise - just the regular ticking/hum of the drive. What do I do now? Do I reset the SMC and then reset the NVRAM/Pram?

Edit: The noise still might be there, but it's definitely not as loud. I have to put my ear up to the keyboard and I hear the typical humming/ticking and what might possibly be the same sound in the background. I can't really tell for sure as my mind might be playing tricks on me.

Thank you!

I've done all that now. Unfortunately, I do still hear a noise. It's the same noise as in Safe Mode, not as loud, but still audible if I put my ear up to the keyboard. (Before, I could hear how I normally sit, with my head about two feet away from the keyboard.)

How worried should I be? Do I need to replace a part?

Thank you very much for your help today. 🙂