No 12V = no CPU boot on Sysyem 11, with the game booting, there has to be 12V from the power supply.
Reseat all the cables going to/from the sound board in the upper left of the head.
Does the game give a quick beep or series of fast beeps on power up? That is the sound board diagnostics giving an "all's well" or error code.
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Rob Anthony
Pinball Classics
http://LockWhenLit.com
Quality Board Work - In Home Service
borygard at gmail dot com