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How to eliminate speaker interference?

I have some Cyber Accoustic (CA2002) PC speakers connected to my laptop.  Periodically, I here some type higher pitched static sound coming through the speakers.  It starts with a slow frequency then gets very fast.   It last about 5 seconds and sometimes longer.   I have a desktop PC under my desk with speakers also.  I use to hear the same sound from them but not as loud.   Sometimes I hear this sound through the headphones in my digital piano across the room.   Is there a way to eliminate it?
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brettr
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brettr
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Casey HermanCitrix EngineerCommented:
Hook your speakers up to a battery powered radio/cdplayer/ipod/  You still hear the noise?  
If so  replace your speakers.  

Do you hear the noise only if the laptop is plugged into the wall power?
If so Check out radio shack and get a device called a ground loop isolator.  They are about 20 bucks and you may need to get a couple of adapters to get it to connect.  But should correct the problem.

Casey
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brettrAuthor Commented:
I was at Radio Shack today but that particular branch didn't have a ground loop isolator.   Here's an interesting bit of information on these speakers.  I had them unplugged from my PC so that only the power was plugged in.  I still heard the interference.   From what the guy at Radio Shack was saying, the GLI fits between the speakers and PC.   However, if the speakers aren't plugged into the PC and still have interference issues, the GLI isn't any good.    Any other suggestions on what's causing it?
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brettrAuthor Commented:
The culprit seems to be my cell phone.  If it's on the desk, the speakers randomly go crazy.   I have some other speakers plugged into a PC on the floor.  Whent he cell phone is near them, they also make this noise.   If the cell phone is off the desk and a few feet away, the noise occurs much less and is quieter.  Are there any speakers that can handle a cell phone being near them?
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Computer101Commented:
PAQed with points refunded (500)

Computer101
EE Admin
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