🚀 go-pugleaf

Make sure that your computers power cord is a three prong plug.  There is 
the possibility it's not being grounded through the socket, or power strip 
if you are using one of those.  In that case try another outlet, and maybe 
plugging the computer in directly rather than through a power strip.

There's also the possibility of things being grounded in more than one way, 
and then you'd be talking about "ground loops" which become a little more 
difficult to deal with.  Stay away from those 3-prong to 2-prong adapters.

Good luck.

-- 
HTH,
Curt

Windows Support Center
www.aumha.org
Practically Nerded,...
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"D" <tarb@bk.ru> wrote in message 
news:1192480473.647816.62910@z24g2000prh.googlegroups.com...
| Hello!
| A background (about 50hz) rumble appears in a sound from microphone.
| Windows XP SP2.
| I tried two headsets (which surely are good). The rumble decreases if
| I touch the computer case. I checked the inside of the case, did not
| find any improper contacts. The sound card is Creative sound blaster
| live ct4830. I tried the latest Microsoft and Creative drivers. The
| Creative driver does not output sound from microphone to speakers at
| the same time, but only from a recording from the microphone. How to
| prevent the rumble?
| Best regards,
| Dima
|