I have a 15" MBP late 2009. When just booted the fan speed is around 2000 rpm.
This is little noisy, specially if i sit by my self in a silent room. I think when i first bought my MBP I could not hear the fan noise when it was just booted.
Is there a way to make this fan noise disappear?
When your MBP was new its likely you didnt hear the fan (or you think you didnt hear it) because your previous computer was louder and you havent accustom to a quieter one yet.