To help you further, can you tell me just a bit more about what is happening?
When you turn the game on it goes to display version, then game ID (the cpu has booted to show the first screen) and then the game goes blank display. This is shown on the video. (Thanks for the video!)
Does the display stay blank, or does the game eventually go into attract?
At this point, can you go into the menu by pressing the menu buttons?
And in the menu, can you go to diagnostics, technician alerts?
What is the game telling you is the problem in the technician alerts?
A couple of things:
When a transistor for a coil is shorted (or the coil shorts and shorts out the transistor) it will pull in, with a fairly loud hum. If you hear that when you power on a pinball, shut power off, and fix the problem before you have a burnt coil wrapper, or burnt boards.
A coil tap, tap, tap as the pinball first activates is the CPU thinking that a ball is stuck (because it sees some problem with a switch) and it's activating the coil associated with that switch to try to get the ball clear. The switch status will be visible in the test menu.
If the game is 'crazy' and it's doing something irrational, like, the switch is NOT thinking that a ball is stuck, but it's activating the coil as if it was... well, the first thing I do is a factory restore (just in case, this isn't the problem in 49 out of 50 situations, but it's easy to do...)
Then I suspect some switch is still the problem. I make sure the balls are all registering in the trough, and that the game HAS all the balls it needs. I go through the ball trough test. I replace the LED's on the optical switch boards in trough (because it's such a common point of failure, and all games this age I suspect the LED's are no longer as strong as they need to be... this doesn't solve my problem, but any time I've got a problem with games of this age it's something I'll do...)
So, the game has all it's balls, you don't have a trough problem, you don't have a switch problem. The switch related to the coil that is being activated by the game is working perfectly.
Is the coil getting power because of a short circuit from somewhere other than it's driver transistor? Like, the wire for the coil return is connected to a flash lamp circuit, and when the flash lamp is flashing the coil is activating? (Very unlikely in this level of technology, but it was something to look for in the System 11 Williams games). A quick look at the wiring to the coil, just to eliminate any weird short circuits is something I'd do... but I really doubt I'd find anything.
In theory, you could have a board problem chip failure doing this, but I've never seen anything like this on a whitestar board.
Let us know what you find... particularly if the game stays on a blank screen and never goes to attract mode.
Thanks!