We just bought our first pinball machine Rollercoaster Tycoon and overall it looked in great condition. We got it from the original owner so it's been only a home used machine.
We set it up yesterday and noticed it would get stuck in the "Power Ride" mode and the balls would continuously run through the machine even with out using the flippers the balls will shoot out drop down and continue again and again until I had to turn the power off.
Any ideas?
The original owner just had the machine gone over by a pinball tech and is working with me to resolve the problem.

Thanks for the advice. All of them looked in place.
I have a pinball tech coming on Tuesday.

Thanks guys

I don't know this game plays but it seems to get a lot of multi balls and some end and can continue to play then it will go into a continuous ball through. (I've only had this game for 2 days so don't know what all the proper functions are)
I've seen on YouTube on some RCT game play that you can get 2 balls locked in the left launcher and I've only seen one in the limited play I've done but it says at time "Ball 2 Locked"
I've also noticed a few times if it goes through a complete game at the end it will shoot out all 4 balls 2 times then say missing 4 balls?

Hey guys update....
Had the pinball tech out yesterday and of course it wouldn't go into the problem of just continuously running balls through while they were there. He went over the machine checked the boards connections (did not unplug and re plug in any connectors or chips) then went through all the settings. He said the "freeze time" was set high made a few other minor adjustments then tried playing a few games.
After they left we played for about 15 min then started the same problem again.
No parts were changed or cleaned.

Yeah I hear you!
The seller felt bad about not resolving this problem for us and was a VERY stand up guy and offered to take the machine back and refund our money. We opted to do this....I'm sure its probably an easy fix but we were not sure if this was the machine for us. Made us nervous if there were some other issues going on with it.
So the search continues......
We did come across another pin that might be the one.

Thank you all for your help!