So today I woke up my PC from sleep to be greeted with a pink, stretched image on my 4k TV that I use as a monitor because it's god-damned 40" big and an actual monitor that size would put me in the poor house. No problem, I've seen that before. Just turn the TV off and back on again.
Except today that didn't fix it. Turns out, it decided it wasn't going to play at 4k 60Hz anymore. 30Hz was fine, but no 60Hz. I tried rebooting my PC, disconnecting and reconnecting power to the TV, spent way too much time fucking around in the nVidia control panel and TV settings, tried replacing the HDMI cable... and even brought over my old PC with the GTX970. Same thing. Pink at 60Hz.
Threw up my arms in disgust, moved the old PC back, reconnected the new PC back up... and it's now working at 60Hz again. ffs. What am I supposed to do, never turn off my PC and monitor ever again? Ugh.
Guess I'll start thinking about a real 4k monitor. A small one. :(