Precision M6600 / Nvidia 4000 M / Port replicator / 2 monitors

We bought a new M6600 of lower precision 10 days ago and everything worked very well with the support of multiple monitors - I was able to have the Office extended across the screen of the laptop and the two external monitors connected via DVI and the duplicator.

This morning, I got a BSOD and what seems to be an update of the driver while I was at a meeting (using only the laptop screen). I have now connected the laptop to the port replicator, and I can't use two external monitors - one or the other, but not both. I restarted the laptop several times.

In the Nvidia Control Panel-> Set Up multiple displays, it lists all three screens, but if I select the third, a bubble appears saying that "this GPU supports up to 2 screens" - but she supported three yesterday :(

I think after a certain number of times where this happened and tried various techniques, the problem is that option Optimus in the BIOS (in video) for some reason any becomes invalid. Allowing it solves the problem.

Tags: Dell Laptop

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