Buzzing noise from new rig

[gi0 220]

Just put together a new rig consisting of:

-abit IP35-E
-E6550 intel c2d
-wintec ampx 2gb
-seagate 320gb 7200 sata
-asus 7950 gt 512mb
-antec p180
-corsair psu
-artic cooling freezer 7 pro

Runs flawless except notice a faint buzzing noise coming from either the video card or the cpu fan. However, i really believe its coming from the video card. Also this noise only occurs when the system is under a load. I hear it whenever i open the start menu on my vista ultimate edition or when i hold down a scroll bar on one of the system windows. I also heard it the whole time i was running the CS:S stress test which my card spit out 148fps during. Thoughts, questions, ideas, answers are all very appreciated.

thanks!!

 

[RoBo]

Swap the CPU fan (so long as a fan is connected to the header the computer will boot).

Remove the video card (computer wont boot but it will help identify the problem).

 

[gi0 220]

switched out video cards, noise remains. does not sound like a fan noise. any chance its coming from my mobo, like a busted capacitor or something?

 

[RoBo]

switched out video cards, noise remains. does not sound like a fan noise. any chance its coming from my mobo, like a busted capacitor or something?

It'ill be from the motherboard, just what I don't know. Could be a voltage regulator tho (more power needed during CS:S)