It's only humming because it doesn't know the words. 
Is the DMD a Cherry-branded one, by any chance?
If you turn off the game, completely disconnect the DMD, and then turn the game back on, is the hum gone?
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Quoted from Robl45:I just checked the boards and they are tight, still humming away. Unfortunately check the grounds doesn't mean much to me, thats why I"m posting here, need more of a step by step of what to check.
"Check the grounds" means check all the ground connections. Each board has at least one ground connection. Sometimes a break is caused by a cold solder joint, a bad crimp on a pin, a broken wire, dirty pins/connectors, etc.
Use a multimeter in diode test mode to check for continuity.
Quoted from Robl45:I didn't see grounds to the boards,
You would have to look at the schematics. They are wires in the connectors.
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