Since re-installing windows a couple of days ago the two monitors on the secondary graphics card are no-longer detected (even using the rigorous display detection button under the NVIDIA control panel).
I have a GTX480 as my main graphics card which has a pair of monitors connected and a GT610 as my secondary graphics card which also has a pair of monitors connected. All 4 connections are DVI to DVI.
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I had a go at removing my primary card this morning and the secondary card is definitely working.
Still not detecting the secondary card's monitors after putting it back together though.
So I took the cable connecting my primary monitor and graphics card, and used that to connect between my 3rd screen and the secondary graphics card and that worked. I guess two of my cables have simultaneously failed, and I happened to choose those two out of the 6 or so cables I own to connect with my secondary card by chance? Although that seems rather improbable
Using another DVI cable, I now have 3 monitors working, two on the primary graphics card and one on the primary output of my secondary graphics card.
I still can't get my 4th monitor detected. It seems the secondary output on the secondary card is not working, I can't get this to work on any monitor with any cable. Is this possibly a software thing caused by re-installing windows 7? This all worked before my windows reinstalled.