I've been experiencing black screens on my RX 460. It's like if the card stops sending signal, the display led starts to blink with no image. It's a brand new system, and my first AMD GPU. I've been exhaustively testing, reinstalling and attempting to narrow the issue down, and I only know that I crash when I use the Crimson drivers.
Windows 8.1 64bit
Intel i5 6600
Corsair 16GB DDR4 RAM
PowerColor RX 460 4GB
Corsair CX430 PSU (430W)
Display LG IPS234V-PN @60Hz-75Hz, HDMI/HDMI then DVI/DVI
(tried on a LG W1952@60Hz, DVI and HDMI>DVI as well)
Any driver version so far
I've ran a memory test (no errors) and spent over 6 hours on the iGPU without issues. I also had no black screen issues using the RX without drivers (but what's the point?). I made sure my chipset drivers are updated, and my Windows as well. I've tried numerous drivers, doing clean installs with DDU every time, and the 16.12.1 is the most stable: It takes 15 minutes on the average on HDMI to see a black screen using it.
I managed to make it 6 hours by creating a TdrDelay QWORD with the value of 8 at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers. I'll still see a crash though, because it's no solution, only a workaround. My SFC is clean. My Event Logs are clean, my temperatures are low, I see black screens even doing nothing at all after booting, just letting my machine sit at the desktop idling. I tried to underpower my card as some people suggested in these forums, to no avail. The card isn't consuming over 8W when idling anyway.
The connection used seems relevant. I crash every 15 minutes using HDMI>HDMI, but it becomes 30-50min using DVI>DVI.
When I crash the keyboard stops responding immediately, but the sound remains for ~5min. I'm using a dedicated usb soundcard. I can't power off the computer, it does nothing. I need to reset it (I hear the CPU fan changing RPM), then I can turn it off and back on. I don't know if the computer posts after the reset only, because I get no video.
I'm out of ideas.