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technical question

I have a D&S 5 column vending machine. When you deposit quarters it registers the coins.
when you make either selection nothing happens, no noise like its trying to dispense and the credit clears.
with all the slides down if you hit column 1,3,4,5 solenoid at top, each will lock up column 2.
I'm trying to figure out if its a bad computer board but before I spend $500 I want to make sure its not
something simple. the only other information I have is when you push the selection vend buttons outside
only two columns of the 5 light up on the computer board. The machine is 17 years old.
thank you in advance
 
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