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Do you still get static with the speakers on and the speaker cable unplugged from the PC, is it a laptop ?, what chipset is your PC, if its a via check for a bios or driver update for your motherboard.
Is it a constant static ? unplug the speaker cable from the computer, turn the speakers volume to a low-medium and touch the metal of the audio connector (usually a 3.5mm jack) with your fingers, does it sound the same as that hum you get, if so thats mains hum and is usually caused by bad grounding, check your outlets are correctly grounded, cut down the amount and lengths of cable from the wall outlet to the PC/Speakers.
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