Re: Laptop + 2 external displays - Nvidia Optimus ... Please.. help
Your problem comes from the fact that an Nvidia chip only supports 2 outputs at once.
So, you need to run both the integrated (intel) + the nvidia chip at once all the time for your configuration to work.
You will need 1 monitor on the intel, one on the nvidia and the last one on either.
I do not know if your laptop allows such a configuration, but you will need to disable Optimus for sure (and select to run both all the time).
As the universe is curved, there cannot be a straight answer...