i also tried all and none of them worked. on some the fans start spin at max speed right after power is plugin and draw 1.5amp no display , on some after pressing power button power draw 0,40 amp no fan spin no display and im getting ram code from power led 3 white 2 amber when power draw is 1.5amp - not when power draw is 0.4 - ram slots looks ok and ram sticks are tested working...