Analogue-sequencer

>  Colin, the sequencer works, its just that the display never comes 
> on.  LED's work and it spits out MIDI, but no cool green !

For the sequencer to work without the display coming on, the CPU interface
on the PLED module must be working, but there is a problem on the module
driving the display.
The intermittent non-booting CPU may also be caused by the PLED module - if
it doesn't repsond to the CPU interface.
Both could be symptoms of a failed PLED module.
Another possibility is that if the 74245 bus driver that handles the PLED
interface is gone, it might have failed in a way that breaks the link to the
PLED display, but makes the CPU think it's OK.
You got a logic probe ?

Best regards,
Colin Fraser
Sequentix Music Systems Ltd
http://www.sequentix.com