No sequence of rebooting, switching input modes, messing with the NVIDIA settings or re-plugging of the DisplayPort cable would bring it back. But then it hit again, and I think what happened was that the desktop power management feature put it to sleep. And then it worked without issue for a few days through reboots of the laptop and power cyclings of the monitor. But then when I tried DisplayPort again it worked perfectly (full 2560x1440). Initially when I first tried it out, I couldn't get it to receive a DisplayPort signal at all, so then I tried the VGA cable, and VGA worked (at 1920x1080). It sounds like in some cases it doesn't know when to awaken after it is put to sleep. From reading this and other threads, it seems to be an issue with the PB278 monitor. I recently bought this monitor and had the trouble with no DisplayPort signal.
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