My U2413f keeps randomly going to black. I don't think it's a PC problem because I have a dual monitor setup, and the other monitor is working fine. I don't think it's a cable problem because I've connected to HDMI, DVI(current), and VGA, and it has the same problem. its energy usage is only 2 bars so I don't think it a power problem. If it's an issue with the monitor settings I can't find what the issue is. The monitor is still on and powered up. I end up having to turn it off and back on to fix it but then it'll go black again a little bit later. It doesn't go black for a while after I haven't used it for a while, but after the first black screen, the frequency of black screens increases until it's only seconds before the next black screen. I have to wait a couple of hours before I can use it again before it goes black. I've tried switching the power cables, I tried reset the computer. I don't know whats wrong. 

U2413f, CN-0XTXXK-72872-59P-AT4L, GPU: NVIDIA GeForce GT 720,