uhh..the only moving parts in a computer are the harddrive(s), CD/DVD drive(s) and fan(s). Your motherboard could have a chipset fan and that could be causing the sound.
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Silent Tuned | 3D Marks 06: 11566
Q6600 2.4ghz CPU | Gigabyte GA-P35 LGA 775 MB
EVGA 8800gt 512mb Video Card
G.Skill 4GB Ram | Western Digital 400GB HD
X-Fi Xtrememusic Sound Card
Antec P180B Case | Scythe Ninja HSF
CM Real Power Pro 650watt PSU
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