Vintage Simmons Drums (UK) Users Group

Hello to all in the group. I am happy to have found out this group 
exists today. I am the proud owner of an SDS5, 7 and 1000M. My 
SDS7 is unhappy at the moment. It had been stored for years 
and a few months back I changed the battery and it did work. 
After a recent move I went to power it up and all I get is the LED's 
lit on the control panel but no digits in the display. The Prog 
lights are lit for all 5 boards and the Trig lights flash when 
triggered. I am not sure what is going on. Am I in some strange 
mode? Perhaps I have the front panel board and Memory board i 
the wrong order? They are currently (Left to Right after the 12 
Voice Cards ) Front panel board then Memory board then the 
transformer. Any help would be greatly appreciated. Thanks! 
Charles.