Thanks for the suggestions. So far I've tried reseating the card and its PEG connectors in the same slot as well as re-installing the drivers and still no joy
I'll try moving the 5830 card to one of the 5770 slots, or to a different machine, when I get a chance in a day or two. I'm sure hoping the card isn't damaged.
In the meantime here's a bit more info on my system config if it helps anyone make a better suggestion for my situation:
- using cgminer 2.0.4
- over-clocking with cgminer command line options, no separate tools being used
- using AMD 11.8 drivers
- Thermaltake 850W power supply