samsung galaxy s5 software issue or hardware?

[AC Question]

My device's screen doesn't display at all when the home button is pressed only flickers on occasion, I have been having issues with the screen flickering for the past few weeks but I figured out that the screen will only turn on as normal if the screen and phone are warmed up by body heat (weird I know) and if the phone is cold it simply doesn't work, my question would be is this a software issue or hardware issue that's damaged?

 

[belodion]

I'd guess hardware, but a repairer would not have to guess.