My speed queen coin-op top load model swt910wn almost always works great but sometimes won't start after money goes in.It's about 4 years old, and has a mother board instead of a analog timer. I have checked all the obvious things, has good elec. cord, power is on, lid is closed, coin slide works smooth, extension pieces on end of slide are all aligned right and are attached to each other properly. When it malfunctions, the coin slide goes in, the quarters drop, the slide comes back out, but nothing happens. The controls don't light up, and water doesn't come on. No lights, No action, Nothing. What's the most likely cause?

Washing Machines - Speed Queen - Coin Operated Topload Washer