I got a similar issue and device configuration (2 x U2414H connect with DP1.2a MST via GTX 770 card). Sometimes monitors (both of them) said "There is no signal coming from your computer" or "Entering Power Save Mode" but sometimes they work perfectly. I noticed that power off/on button of the monitors do not totally shutdown the monitors. Everytime I got this issue, I need to unplug a power cord and reconnect a power electric to monitors, waiting for DELL logo, and then monitors will detect signal from graphic card. I used DP cable come with U2414H follow setting up steps according to User Guide.
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