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I believe I have found out what happened to that power supply. I opened up the case and found water inside - large drops moving around inside the bottom of the case and obviously shorting the bottom board out as they moved. That explains the 'trying' to work nature of the fault. I had been leaving the power supply out in the observatory and I guess as it cooled off it has been drawing in moist night air which condenses at some point and builds up into drops and gathers at the bottom of the case. I have disassembled what I can and blown it out with compressed air. It's now sitting out in the sun to try and drive out any residual moisture. Hoping its going to work again when I get it back together. It was a good supply, with good shielding, intended for LED light strings I think. Fingers Crossed.
In other news, I believe I have fixed my camera shutter and it may not need replacing. One of the shutter curtains had been pulled out of the slot it slides in (after snagging on that cotton bud), and after I got the front of the camera off and confirmed the springs and actuator arms were ok, I managed to get the curtain back in the slot without breaking anything. Cycled it a few times manually with the gear wheel so it should be ok when I get time to put it back together. Must get onto cleaning that sensor properly.
Certainly a better result than I expected.
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