[rikardo1979]

(11th Mar, 2013 05:41 PM)effemmeffe Wrote:  I already tried two power adapters, one is from my samsung cellphone, the other is the one I bought from RS in bundle with the RPi.
The HDMI cable is this: http://goo.gl/hrZ5p I don't have any other HDMI cable and I'd like not to buy one just to test... Do you think it's important to do this test?

try analog audio out,use any headphones or any speakers with 3.5 jack. if you still hear the noise than it could be the PSU or LAN (if u using it) and if the noise disappear than it would be the HDMI cable or RPi itself ( I doubt)