one of the 2pacs is only displaying the blue led (it might be a mix of blue and green, so purplish) and is not detected by cgminer.
I can't offer anything on the unusual LED state, but what happens when you unplug and replug the nonworking unit with cgminer running? Does it detect the new stick?
Nothing, the led goes to the purplish colour and is not recognised.
I'd bet one of the chips is roasted.
Poor little ASIC.
My thoughts exactly.
Would have thought it more likely to 'fail' whilst running it, due to heat stress etc, but i've had it fan cooled the entire time and the heat-sink rarely got warmer than 'ooh thats warm'. To fail on start-up is unexpected.
I'd bet one of the chips is roasted.
That's disappointing. Does 1 faulty chip render the whole unit defective? Is it possible to be repaired? Thanks for the quick reply btw.