My piece of crap video card keeps getting some frigging interference form some dubious device in my system

It seriously f*cks my screen all getting wobbly and stuff... I sent it back thinking it was busted, received a new one, same sh*t all over again... And none of the outlets in my study are properly grounded, so if that is what's causing this issue, I'm feeling pretty cr@ppy about that!
But on the other hand, there's no war, famine or epidemics going on where I live, so I should look at things from the brightside <starts to sing>