Heya - i had a simular problem with a pc monitor just today.
 Seems that the svga monitor cord they sent with it was crap.  It was like half as big arround as the other cords i have - and after i swapped it out - there was no more ghosting.
  your wire gauge may be too thin... and or maybe it also needs those anti noise shields.  I think some cords have foil arround each wire - and also have the anti noise filters sealed into the ends of the cords.  These prevent cross talk and interference from other electronic sources.
 Good Luck,
 Steve
 : )