Ah, I finally got multihead to come up. I finally tried the other card. It came up fine. So perhaps the old one is bad.

I put the old one back in just to confirm, and now I'm waiting for the new one to boot. Knock on wood: I hope it still works ok.

The old card would do video with one gpu, but not the other. I'm tempted to put it in and see if I can send any CUDA code to the unresponsive gpu. It otherwise seemed ok as far as the system seeing it, aside from the driver not being able to boot it.

Another wrinkle is that we may be hamstrung for cards. If the hdmi idea I posted about earlier works, then we may be ok. It is unclear now. Jose probably has more of these things laying around in his lab anyway.

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