I boot up the system and leave it running with no processes open and the display dies.
I am not using the auto fan on these R9 series, seems like they have enough issues with fan control and heat already, i was using afterburner to control the fan speed, locked it at 75%, No OC's, fan only.
I got mining for around 60 minutes max on these cards, I have stripped the rig down to one card and it still happens, the display dies at random times, not mining, mining, one card two card three cards four cards, its the same issue, I've swapped out the other main components and I have it down to either driver issues or an acutal hardware fault on this batch of c ards I received. Either way its too much hardware to sit in the corner useless
Format the drive, do a clean install. Activate Windows, disable Windows Update, Firewall, disable unused peripherals in BIOS, install only USB and network drivers.
Under power management, configure it so that Windows does not put any h/w to sleep. Disable any "green" features in the BIOS or MOBO utilities.
Actually it is best not to install any MOBO utilities, just the driver for network and usb.
If you don't get blank screens with Standard VGA, continue to install 13.12 AMD driver, install just the "Display driver", uncheck everything else.