a dead pixel appeared in the central to northwest part of my screen. its a black spot. are there really any ways to fix it ? if i bring it to a computer technician, will him be able to fix the problem or it will require changing the display ? i tried using the pixel healer program for one hour, , heat using a glass of hot water and pressing the screen but the spot did not change. it also appears to be un-movable. is it worth to change the display or its better financially to buy a new screen?