Odd issue

An extremely high-pitched squeeling noise coming from my computer, that seemingly becomes more noticeable the further I am stood away from my computer. Any idea what it could be?
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  1. It could be a fan bearing going out but, I think if you trace that back to the source, you will find it comes from the PSU. A phenomena known as "coil whine". It does not mean anything in itself (it is considered a minor manufacturing defect) and you may be able to get rid of it by changing the load on your computer - adding or removing hardware (hard drive, fan(s), graphics card etc...) if the PSU is the source.
  2. Interesting, I don't have anything I can remove.

    Just:
    GeForce GTS450 1Gb
    Biostar A960A3+
    AMD Deneb 955 Black Edition (3.2GHz)
    2x 4Gb Corsair XMS3 (PC3-10600 in dual channel)
    Antec HCG520
    Samsung HD103SJ

    No case fans
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