anyone know what this sound is?

Hehe, sounds like a fan yeah, just unplug them one at a time if it goes away then replace that fan.
 
seems to be the antec 520w power supply fan, as they easy to open up?

Yup, very easy. I had to open one due to a similar rattle. Ended up being a small piece of glue-gun glue that had come loose and hitting the fan. Just stay away from the capacitors if you prefer your muscles voltage-free :D
 
Be extremely careful if you intend to open up a PSU.

Touching a capacitor is not a matter to be taken lightly.
 
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