Update
Updating database... Please wait.
Monday 1 January 2018 at 21:56
The center led is only a 5v led. It just shows if there is 5v going to the board. Have you checked for corrosion? DE is not really different than any other system when it comes to booting. it is actually a copy of system 11.
Here is some good info
http://techniek.flipperwinkel.nl/desega/index2.htm#p...
Source: http://pinside.com/pinball/forum/topic/help-with-de-gr#post-4153345