I just bought a Dell U3014 and I have a problem. I have a EVGA GeForce GTX 285 and running it at 2560x1600 with the DVI cable from the monitor. I get random flickering lines across the monitor when I turn it off and on again. Here is how the problem works:

Everything is shut down ( PC and monitor ).
I start the PC & the monitor and I have no problems. I turn off the monitor and turn it on again ( while PC is still working ) the problem appears.
I restart the PC, the problem is still there ( the lines appear even in low resolutions when the PC is starting).
I turn off the PC and the monitor and the problem disappears.

Maybe is not the monitor and it's either the graphic card, or the connectors from the graphic card or the DVI cable. I'm thinking to buy a geforce gtx 6xx with displayport or minidisplay port so I can use the DP to mini-DP cable from the monitor but I'm not sure this will solve my problem. Here is a video with the flickering lines: http://www.youtube.com/watch?v=nrM59AM14A0&feature=youtu.be

I made it with HTC One X. I hope it's clear enough. I recorded on the left side of the screen but the lines appear on the right side too. most of the lines appear in the middle part of height but some lines appear at the top too.

Any suggestions?