Looking back over the images taken it appears that the cooler failed on January 17th 2010 – so nowhere near as long ago as I thought, and it wasn’t at the time the PSU went down.  The number of hot pixels dramatically increased in the images, and the noise may have gone up a tad, but apart from the hot pixels there wasn’t too much to show for it (apart from the extra unnecessary processing Noel would have had to have carried out Interesting!  Down to the high speed of the Hyperstar and the short sub-exposure times.  If I worked at higher f-numbers the Peltier failure would have been more quickly recognised that’s for sure.

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