Grounding a shielded cable?

I have a noisy LCD monitor, after some research i decided to shield it by warping an aluminum foil to VGA cable, after poor results, i read somewhere that i need to "ground" the shield for make it work. what is grounding? it is enough to simply connecting the foil to earth? also what about using an... show more I have a noisy LCD monitor, after some research i decided to shield it by warping an aluminum foil to VGA cable, after poor results, i read somewhere that i need to "ground" the shield for make it work.

what is grounding? it is enough to simply connecting the foil to earth? also what about using an normal copper wire for that?

thanks.
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