Mac Pro Power Supply making noise (even when turned off)

Hi everyone,
My Mac Pro Early 2008 (Dual quad core 2,8) began to make noise a while ago and it drives me mad.
The sound is (100% sure) coming from the Power Supply. The sound is not mechanical, but electrical, like an oscillator crackle sort of.
First I thought it was the PSU itself, so I had it replaced with a new one, but that did not change the situation.
The (new) PSU makes excactly the same noise, even when my computer is turned off (but still connected to the power socket in the wall).
I've eliminated all possible factors that could create an interference (other electrical devices). I even completely switched off the power of my office, except for one power socket; the one I used to test the Mac. As soon as I connected the Mac, as soon the noise came back. So, it's got to be inside the Mac.
So my question is: if it's not the PSU, nor the power of my office, what could it be?
PS: I've tried a UPS too... but that did not change a bit.
Thanks for your suggestions!

Hey
I appreciate the attention and help from you guys. I installed hardware monitor and this is what tells me:
Ambient Air 22
CPU A Heatsink 28
CPU B Heatsink 29
CPU Core 1 27
CPU Core 2 30
CPU Core 3 29
CPU Core 4 27
Expansion Slots 32
Hard Drive Bay 1 30
Hard Drive Bay 2 25
Hard Drive Bay 3 24
Hard Drive Bay 4 24
Memory Bank A Point 1 38
Memory Bank A Point 2 44
Memory Bank A Point 3 44
Memory Bank B Point 1 37
Memory Bank B Point 2 44
Memory Bank B Point 3 48
Memory Module A1 65
Memory Module A2 65
Memory Module A3 62
Memory Module A4 54
Memory Module B1 69
Memory Module B2 65
Memory Module B3 59
Memory Module B4 57
Northbridge Heat Sink 63
SMART Disk Maxtor 6V300F0 (V60E4NQG) 41
SMART Disk ST3500630AS P (9QG0H24P) 31
Do you have any suggestions? is it safe to find a program to regulate the fan of the power supply down or can this damage the system?

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