Host had opened, the display changes to deceive the

In fact, I bought a computer for several years, but the flat.Has the effect of the display is very clear.But one day I opened with suction vacuum cleaner dust.And then examined the inside of you plug, unplug and re-inserted , The location will not pose any problem.That is later seen on display change deceive, and do not know whether we did not play well with the graphics are.I do not know which is the graphics, graphics is not above board Of? I should not move to the card because I moved I know what it is.Would it be possible because I had opened, which did not plug the power cord or a good way to move the issue of graphics

you open the box or open display? chassis moved down the card should be no problem, only That the display, you come up with the question of