My St Pro model arrived yesterday on pallet.
As i had some damage at the speaker panel i took the pannel off and removed the pannel decal.
After reconnecting the panel my pin doesnt work anymore....

Display remains off and cant start a new game.
Only the playfield and gi light is on....

Tested already;
3 voltages 5V 12V -12V on powerboard was ok
fuses all lights are on
reseated all cables
reseated rom chip

No idea whats going on...

Thanks for all feedback already.
I have to make clear that its a stern of 2014 and bought it second hand.
Pin was working on freeplay and dmd was perfect; only played 2 games after arrival. After the removal of the speaker pannel these issues came up. Not sure this caused the problem...

I only removed from pannel:
Ground wire pannel to backbox
Soundcable connector
Dmd connector
Dmd flat cable (cant be connected wrongly; click connector only 1 side possible)

When going menu i can do test sound etc.. But hard without screen...

Thank you so much.
Youre right.... never thought it was possible to connect in 2 ways... dmd working.
And due the reset it was not on freeplay anymore.
thank you all!!