why is my hotpoint fridge freezer making a loud noise

I recently purchased a Hotpoint fridge freezer and it has been working great until recently. Now I’m noticing a loud noise coming from it. I’m not sure what is causing it or how to fix it. I’ve checked the fan and it seems to be running fine, but the noise is still there. I’m worried that something might be wrong with the compressor, but I’m not sure. Does anyone have any ideas as to what could be causing the noise and how I can fix it? Any advice would be greatly appreciated.