low noise hissing from monitor

I peops I bought a aoc N19W LCD widescreen monitor yesterday thing is theres a low hissing noise coming from it kinda like the sound that comes from speakers if you turn the volume up but dont play anything Im not using the monitors sound tho as i have my own speakers I was just wondering is this noise normal it doest start till the monitors been on 15-20 mins and my resoultion is set as recommended in the user manual thx in advance

 

Try actually muting the audio using the remote .. otherwise it's not usual.. wait for the bang :lol:

 

hi m8 Im not using the audio off the monitor at all im using speakers Im gonna bring it back i only got it yesterday lol grrrr