Try this:
amd app sdk 2.7
catalyst 12.8
and cgminer 3.0.1 or 3.1.1
as in this thread:
https://bitcointalk.org/index.php?topic=179718.0Other think to try is if the card is seated properly
You need a multimeter for the rails, but the software first.
Okay, I'll first try the latest Catalyst driver, then go to 12.8.
I'll change the CGminer versions first.
And GUIminer is not helping the errors much.