Originally Posted by rwtd
No-signal-during-boot seems more like a firmware issue. It happens occasionally, I think it's similar to the vertical line issue. There is also a pattern to the flickering, 9 out of 10 times the display flickers off and on when I switch on the external DAC. (The PG279Q had this less than the XB271HU if you mute the sound in the OSD and disable the Nvidia sound device in Windows.) Sometimes it also flickers when I connect a usb thumb drive to a usb port (not a monitor's usb port). I also had it flicker once when my desk light was in a state between on and off, but that could be more imagined as I was focusing more on the flickering of the desk light.
I did research on the issue, it can be caused by several factors:
- Nvidia Maxwell GPU compatibility issue (some manufacturers published a BIOS update and Nvidia a driver hotfix).
- BIOS configuration (configuring PCIe Gen 2 instead of Gen 3)
- Random glitch => fixed by unplugging the monitor from AC for a couple of minutes
- Electrical interference => your case
- Low quality cable => my case
Also if you use a "regular monitor" (for example 60Hz/1080p) you won't see this problem even with a low quality cable.
I can confirm 99% sure my issue was the cable. This is how I tested:
- Crap cable, turn PC on and off 3 times => no signal. Rebooted PC several times, sometimes it got signal. One time the signal vanished as I was entering the BIOS config utility (!).
- Stock cable => ALWAYS got signal (turned on and off several times and several reboots)
- Just to make sure, tried bad cable again => no signal, switched to good cable => signal. At this point I considered it confirmed that it was a bad cable.Edited by EXPERIMENTONGOD - 6/30/16 at 6:49pm