Question: If the "cold drink" vending machine was unplugged and the buttons were unresponsive, WHY did the saboteurs deliberately illuminate the front of the machine? Wouldn't this ATTRACT people to the machine, only to subsequently arouse curiosity when it failed to function (as it did with Mulder)? The more logical approach would be to disable the vending machine (including the illumination) and tape an "out of order" sign on it. People would then just ignore the machine, arousing no suspicion. The illuminated vending machine gimmick looks like an illogical contrivance to advance the plot.
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Chosen answer: If they had put an "Out of Order" sign, or left it unilluminated, someone in charge might try to have it fixed or replaced, or could have checked to see if it's plugged in, etc. By leaving it illuminated, it doesn't look out of place and simply not taking money wouldn't arouse too much suspicion. In my own life, when I've come across a seemingly working vending machine that won't take my money or dispense drinks (but gives my money back), I just find another one instead of calling someone or reporting it. But yes, it is very convenient to the plot that Mulder just happens to try and use this particular machine.