On my ps3 controller my Triangle Square Circle x button will not work.

SOURCE: triangle button sticking

Hey there I have used a "SMALL" amount of baby powder, its non conductive so you dont have to worry about static...just rub a bit around the edges of the buttons depressing them as you go. Work it in and blow off the excess. Try that its a quick fix i have used in the past. anymore problems with it answer back. Hope it works for ya

SOURCE: ps3 controller wont work

its time to change

SOURCE: ps3 controller triangle circle box

Was anything spilled on it? This is likely cause for buttons to stick or become unresponsive. Has the controller taken any major impact? I.E thrown at wall? If none of these, take a pin or paper clip, turn controller over, and gently push the reset button. I do not recommend taking controller apart, as springs for the triggers are easily broken and will void and legitimate repair done by Sony.