I ordered a new power supply, arrived a few hours ago and stuck it in the machine - it's run totally fine for the past 5 minutes which is a record in my book - since the last post, it lasted again 3 minutes before konking out, breaker didn't flip but back to dead. Crossing my fingers as now I'm trying to cut a unit out. My guess is the power supply was fried from years of work and travel, just happen to give on this one project as it was working harder than usual.
Thanks for all your help guys, greatly appreciated!
Jon