I have recently purchased an Hp Pavillion p6102f with the AMD Phenom II X4 925 2.8GHz processor. Since the day I purchased it, I have been tormented by a high frequency whistle/whine almost exactly like a mosquito whine. At first I thought it may have been one of the cooling fans..GPU, PSU CPU and did a 'finger stop' on each one in turn. Noise still there. Tried disconnecting the HDD by unpluging the power cable. The noise became quiter and more intermittant, but still there. I have contacted HP's customer no-service by phone and support forum and even called a few local repair shops, but HP says there is no problem and the repair techs say that they didn't hear the noise or they refunded the bench fee (imagine that) with defeated looks in thier eyes. This noise is driving me insane! Help me make it stop! Or at least understand why.
IF this isn't posted in exactly the right catagory.. I fit best as I could
Power supply could be dying on you. Notice you said you unplugged the hard drive and the noise lessened. Try unplugging the hard drive and optical drive, see if it gets to be even less. That's what I'm guessing is that you may have a power supply dying. If that's the case, you need to get that replaced right away as when power supplies go, they can potentially fry other components like a motherboard or cpu.
What are the full system specs and the rating of the power supply?
Hm. Yeah, like I said, I can't be sure, but my guess is that you may be looking at a power supply issue, because like you said, it fluctuates with the load you put on the machine, and you said it lessened when you disconnected your hard drive. I may be wrong, but if it were me, without looking at it, I'd probably start at the power supply.