I recently bought two Dell U2515H monitors. One is working perfectly the other constantly flickers on and off and occasionally just goes completely black and I have to restart it. Occasionally it wont do this for a while and seems to be working then will randomly begin flickering again.   I've tried switching the cables around and tried connecting with DP instead of mDP and even bought some new cables but nothing seems to work, and considering the other monitor works just fine I'm wondering if there is anything else I could try before I claim on warranty as i'd rather not go thorough the hassle of replacing it as I need it for work. If it helps at all I'm on windows 10 and my video card is the Nvidia GTX 970. All drivers up to date.

Thanks