Hi there,
Ok, this Virus Kb is almost 20 years old and haven´t used it for a year... still loving it.
When I try to put it on, the display is empty. It´s lit, but nothing to display. 2-3 times it was dim and went on after a minute.
No output, no of the other functions is working, no ohter LEDs.
I replaced the battery, tried a factory reset and tried to renew the OS ( the display flickered, when it received the Sysex data - so still some live in the old chap )... nothing 
Any ideas what I could do?
Best,
Ralf