What do you reckon the problem would be with the displays - the board? How much to replace if required?
Could be the 3/16 fuse on the solenoid Driver board
Could be the HV section transistors are open. The are easy to source;
http://www.rtbb.com.au/catalog/product_info.php?cPath=22_128_130&products_id=1127
I upgrade SD boards via Clay's guide and extend that upgrade to the entire HV section, as described here ;
http://aussiepinball.com/index.php?topic=158.0
So doesn't sound too expensive to fix if there is a real problem.
That would be my assessment. However, who knows if the Displays are all damaged (worst case scenario) - certainly a strange coincidence if that is the case.