Why my brand new MAC Mini has electric current noise??

Just bought a MAC mini last friday:
2.5GHz Mac mini
2.5GHz dual-core Intel Core i5
4GB memory
500GB hard drive1
Intel HD Graphics 4000
OS X Mountain Lion
but i can hear the electric current sound when i use it to veiw the web page even i mute the sound, is this normal or i need to return it?
i also want to upgrade memory to 8 GB or16GB so whats the different between 8GB and 16GB? dose 16GB apparenta lot faster than 8GB?
i only use this MAC mini to paly WOW and do some graphic design work with ADOBE CS6.
Thx

It can be any number of things:
A noise from the AC adaptor.
The sound of the HDD motor.
Sound from the fans.
A buzz produced by the display.
Hard to know which or even why. Take it back and have it checked where you bought it. If there is a defect then they will replace if for free, no questions asked, within 14 days from purchase.

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Why my brand new MAC Mini has electric current noise??

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