all 3 comments  [–]CSR_Man 1 point2 points  (2 children)
Preface: These problems are so unique to your setup that's it's
going to be really hard for us to help. Here are some quick
fixes to the most common causes.  You said you hear the noise
only when it's actually recording.. is that when you're using
your laptop as well?  Have you tried turning down the input
gain? That may be a quick/easy fix.  Make sure no wires are
connecting/laying on top of each other.. that extra noise could
be from a power wire, or the PSU if it's relatively close to
your sound card. Try moving your soundcard to the slot furthest
away from the PSU.  It sounds obvious, but try moving your mic
physically as far away from any electrical components as
possible. It could simply be picking up excess hums.  Make sure
NONE of your connections are touching any sort of metal in your
build, that is a major cause of issues like this.  Go to control
panel -> hardware and sound -> sound -> right click your
microphone and click properties -> clic