Checking the outputs from the power supply again i could not seem to
see a power on reset pulse on the reset line on my scope (its a pretty
basic model but i should be able to see a reset). There were two more
10uF 16v caps in the power on reset circuit on the psu board and they
had gone open. Replaced them and the thing powered up normally . The
uP was waiting for a power on reset i reckon - anyway seems fine now .
Thanks for your help - Neilish.