I just put together a Pentium II 400, Tyan motherboard with 64mb ram, and a new box and power supply.  Transfered all old components to new MB and processor (Hard drive, floppy, sound card and video card).  When the computer is started every AM radio in the house sounds like a jet engine is starting up.  The interference is due to the computer since it stops as soon as the computer is powered down.  The old motherboard and processor did not cause any interference so I don't think it is due to improper grounding at the outlet (it is not a three wire electrical system).  What may be causing this interference?

Steven

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