do you hear a boot chime? do you have 5v?
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check the LEDs on the power driver board, are they lit?
again, do you have 5v?
if no chime the sound board is not getting power, either 5v for the logic or the DC for the audio amps... since you have random dots on the DMD it sounds like your DMD board isn't getting power either..
check the 5/12v power connector on the left side of the power driver board next to the CPU board, see if it has come loose
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