Pick this miner
https://bitcointalk.org/index.php?topic=475795.0Install back the 660Ti
Open cmd.exe, go to the miner folder, type
sgminer -n . That lists the hardware usable by the miner
You will need to use sgminer
-d 0 or sgminer
-d 1 (and the remaining command line) in order to point the miner to the proper device.
I've read there are issues with 290's without display attached. I don't know what OS and Catalyst versions that was, though.