hi everyone. today afternoon, while playing some songs, my pc got stuck (the same sound tone played briefly) and it stopped working. when i press the power button, the MoBo LEDs light up, the MoBo fans start, but the fan at the back of the cabby (connected to a fan power slot on the MoBo) does not start and also there is no display. seems like it's not getting into BIOS. i have tried changing the GPU, RAM, removed the CMOS battery, pulled out and plugged in the power cords on the MoBo, but no luck! any idea what might have gone wrong?