I have had the same. I went out a couple of days ago (-20 c) and took some pictures for 5 or 10 minutes. Everything was fine. The next day, midway through the day, I go to turn on my phone and 3/4 of the display is black with only the top quarter showing any sign of life. No crack on the glass but when I took a closer look, you can see the actual LCD display cracking under the glass. I contacted both Rogers and Samsung and now, I think I will send the phone directly to Samsung as this is what Rogers would do anyway (I think). I just got off the phone with Samsung support and they activated a repair order for me and emailed me the shipping information for UPS shipping to Vancouver. The support person for Samsung was pretty nice to deal with and now, I have to ship the phone and see what happens.
They encase a "$700" gaget in cheap plastic. My first s4 broke falling from my shorts pocket at the gym. Screen wasn't even cracked but it wouldn't even turn on after.
Exactly the same , my s4 for no reason just had a black screen except for the top 1/4 fuzzy but could see the very top line for battery network coverage etc. rang Samsung and they said they would send me out a pack to send the phone to them, tried my phone about 4 hours later and noticed a crack had appeared internally under the gorilla glass, this crack was not there when I rang Samsung initially and the phone never moved off the table.... I really hope this is covered under warranty... Nearly exact same story as this lady.
Dusmeo let us know how you got on?