I just wanted to mention an issue here incase anyone else happens to come across it.
I received the XR341CK a couple of days back. On trying it out first time it worked absolutely fine. Later on in the evening I had turned my PC off a while. When I went back to it later, the PC would not power on at all. I switched it off at the wall and then back on and it did power on but kept turning off again after a few seconds.
My first thought was christ sake, the PSU is on the blink.
However I hooked up another old 1440p IPS monitor I had and the computer worked fine.
Went back to the new ACER and it actually booted up fine, and was working no problem. I shut the PC down through windows, and then turned it back on and this issue was back again. My computer kept shutting off after a few seconds. I also noticed this time there was a weird beeping sound coming from my computer. Certainly not a motherboard error sound. It was something else.
At that point I unplugged the displayport (PC end) to minidisplayport (monitor end) cable and the sound stopped. If I plugged it back in, the beeping was back.
I also noticed that my motherboard was behaving as if the CMOS battery was dead too. The bios was resetting each time, forcing me to enter setup and put everything back. (Using Asus z97 Pro Gamer + 4790k + Kingston RAM at 1600 + x2 r9 290 in crossfire)
So I ditched that cable and used an older displayport to displayport cable and so far it's working fine.
Maybe just a dodgy cable, but I have never encountered a dodgy cable causing such behaviour and sounds before. I still have no idea where that weird sound was coming from.
Otherwise the monitor is great. No significant backlight bleed issues compared to some of the earlier monitors I have seen. I replaced the Phillips 40 inch 4k monitor with it, which is also great, but not for my main gaming rig.