i removed a dying battery from my sq80 about a year ago and it was working 100% until that point
it has been sitting unused/untouched for about a year until i finally ordered a replacement which i installed yesterday
i plugged in the keyboard connector backwards and blew F3 / F4, but have replaced them and now it appears to power up normally
problem now is i am getting zero output, both from the keyboard and external MIDI
MIDI out seems to be working fine
any ideas on what to check?
thanks in advance