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So I have 3 GTX580's in SLI and recently updated to the most recent Nvidia drivers, and my SLI was no longer working, and the other graphics cards were showing up only as hidden devices in windows 8. I decided to completely clean off the drivers for every card then re-install them. Yet now only my one GPU that is directly connected to my monitor is showing up, and the other graphics cards are nowhere to be found, even as hidden devices. I can't seem to get them to show up anymore. Any help or advice would be greatly appreciated.

Thanks all!