Bill, your post is two years gone, but it makes me mad, I ave to answer to it! You write:
"This is nonsense... FCC... RF shielded" etc. You get things mixed up there! FCC states that no equipment is allowed to _emit_ RF that can cause harm to other equipment. Noise interference is not neccessarily harmful and cannot be eliminated anyway - or only by encasing the whole unit in a few inches of lead-cladding - without the tiniest whole in it!
"These Problems... many ignorant users... false answers" Well, that's incredibly ruse and totally out of place. In any forum you have misleading answers, but facing Dells famous stance of answering very little or not in a very helpful way I appreciate every suggestion how to rectify things. But then again I have lots of practical exoerience with computers and can guess quite well what might work and what not...
"Pay attention to... ground loop. That's your problem". Did you mean answers liek that? You could go and work for Dell!
I am not a software engineer, I am actually an electronics engineer with quite a bit of experience in RF, working in the broadcast industries where interference (or rather the containment of) are of utmost importance. The noise experienced by Chaplum happens a lot in my Laptop (i8200).
The noise is directly related to the content of the display - if lot's of HF is present (i.e. a nice full command window with hard b/w edges) then the high frequency whining is quite loud. Interestingly it is audible without any sound-devices in use, which suggests that a voltage driven part is emitting the noise, even physically. No ground loops there, it's even happening when running on battery.
So much for being rude and unhelpful in a public forum. Please be a bit more considerate in the future - the quality of the forum could only benefit!