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I had 2 Titan Blacks and 1 Titan. The system worked fine; after initial problems with Nvidia-driver related black screen which I was able to fix. Today I added a fourth Titan Black (3 ASUS Titan Black and 1 EVGA Titan) (I also upgraded my PSU before adding the new card to a Corsair 1500i, from the 1200. This worked fine).

When I switched on my system I got the following error:

The system is running in low-graphics mode

Your screen, graphics card, and input device settings could not be detected correctly.
You will need to configure these yourself.

I am using Ubuntu version 14.04.

Update: I restarted the computer and this time the mouse and keyboard weren't recognised/responsive. I then unplugged my usb wifi and restarted again. This time Ubuntu loaded without any problems. Could it be a problem with my PSU?

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