Yes, correct, it is a dry joint in the PSU board. If you take the box apart, you will see two circuit boards, one small one where the power lead plugs in and another on where the front on/off switch connects. Take these out, then heat every solder joint until molten, then leave to cool. This should fix it. Mine did reappear a couple of times, so did it again and touch wood, I think I've got it now. Give it a go.
Graham Langford
December 2009
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