PC making weird noises

[longers]

For some reason whenever i play a video or a game or anything involving sound i get this feint high pitched computer whine coming through my speakers. at first i thought it was just the rubbish on board soundcard but then i don't ever recall noticing this sound previously, just in the past few days. as soon as i stop playing the video/game/music etc the whine stops.

The motherboard is a Gigabyte MA790XT-UD4P which is realitively modern and im assuming it should be able to play video etc without this whine ?

Also whenever i move the scroll wheel on my mouse i can hear this weird glitchy scraping type sound coming from the actual computer (not the speakers), again its VERY feint and i can only notice where there is silence... but it still makes me think "should it be doing this ?". If i put my head up against the computer i think i can maybe hear it coming from the PSU, but it could also be the motherboard. The same sound is also coming through my speakers (i noticed this when i cranked my speakers to max and then started moving the mouse scroll wheel)

The sound only happens when i move the scrollwheel on the mouse, is this normal ?

Does anyone have any idea what might be causing these noises or are they normal and to be expected ?

I recorded the sounds and uploaded them below, bare in mind i had to boost the volume loads to make them audible without the need for you to crank your speakers.

The first sound is what ALWAYS comes out of the soundcard, i hadn't even noticed this until just now when i cranked speakers up full volume to see if i could hear anything.

Standard Noise - http://www.sendspace.com/file/mh5mrt

Noise when playing video, games, music etc - http://www.sendspace.com/file/q8a8mi

Noise when moving mouse scroll - http://www.sendspace.com/file/4dzndh

 

[longers]

oh and my specs are

AMD Phenom II 955 BE Quad Core
Gigabyte MA790XT-UD4P
ATI Radeon 4890 1gb
OCZ 600w modular PSU

Computer is about 6 months old and seems to be running fine apart from these noises.

 

[EsaT]

The sound only happens when i move the scrollwheel on the mouse, is this normal ?

You're not just scrolling wheel but also content on screen.
That makes parts of the PC to work every time when screen jerks forward.
Also in games especially graphics card is under heavy constantly fluctuating load which can cause coils of its power regulation circuitry to vibrate keeping all kinds of squeeling/whining noises.
(besides possible direct audible noise those circuitries always generate electromagnetic interference)

Integrated "sound cards" are very prone to interference so like you noticed increasing signal amplification of active speakers brings out that background noise/interference.
If you've recently lowered sound volume in software that might have made you increase amplification in speakers decreasing signal to noise ratio.

Just from the look of spectral analysis of that static you don't live in Europe but in somewhere with 60Hz AC.
In that load sample there's now also 30Hz component with its own harmonics added to that and then strong 1kHz signal if you've been wondering what noise that is.

 

[longers]

You're not just scrolling wheel but also content on screen.
That makes parts of the PC to work every time when screen jerks forward.

ok, but it didn't used to make this noise...

and none of my previous pcs have made this noise when moving the mouse scroll wheel

Also in games especially graphics card is under heavy constantly fluctuating load which can cause coils of its power regulation circuitry to vibrate keeping all kinds of squeeling/whining noises.
(besides possible direct audible noise those circuitries always generate electromagnetic interference)

ok, but again... im pretty sure it didn't use to make this noise

If you've recently lowered sound volume in software that might have made you increase amplification in speakers decreasing signal to noise ratio.

ok good point, will look into it

Just from the look of spectral analysis of that static you don't live in Europe but in somewhere with 60Hz AC.
In that load sample there's now also 30Hz component with its own harmonics added to that and then strong 1kHz signal if you've been wondering what noise that is.

[/QUOTE]

i live in London, england !!!!

 

[EsaT]

Weird...
60Hz would also coincide with refresh frequency of LCDs so could it be that GPU has same frequency cyclic power draw causing that spike... (LCDs themselves tend to have high frequency sounds)
Btw, How did you record those? By mic or recording straight from "sound card's" output?
(Spectran and Spectrum Lab can do analysis straight from what sound card is playing out, that's how I checked what noises those samples contain)

Then again OCZ PSUs don't have high quality capacitors so maybe something could be leaking through also that way and not just through RFI.
(at least bad secondary caps could leave such interference causing noise/ripple into output voltages)

 

[Konzul]

Have you tried to replace the hamster inside your case? Maybe it is at the end of its life cycle...

 

[ETNiES]

Had this with my copperhead but only with my speakers up high, it is your mouse, interference from it some how