GPU mining only sitting on 19 C
Well that's not right at all... typo, or is that what it's actually saying?
Maybe we have some confusion there - I was referring to the CPU temp while running GPU mining. The actual GPU's are running much hotter - atm one runs at 85ish and the other at 67ish - I will be adding another fan to help the hotter card.
85'C is a little hot IMHO. What gets me though is that you said in your OP that it only shuts down once you've started the Litecoin mining. What program are you using? Try using the newest version of Cgminer if you already aren't. You might have something improperly configured.