Using the file browser to prehear samples, right?
Like Bellows said, I think the reason you’re hearing a tiny noise is that the sample is actually just a single cycle/oscillation. In other words, a VERY short sound
So, you will need to load it (double-click the file) and possibly, loop it, before you can actually play it for a sustained amount of time.
If it’s a quality source, the sample is already looped. And with default settings, Renoise will recognize this on import
Otherwise, you will have to enable looping each time you load the sample, or check out some of the approaches mentioned in this thread