Question GPU not working when outputting to 2 monitors

[rajkovic.petar2000]

I recently bought a new GPU (AMD RX 580 8GB). Before that, I was using an R7 370, so the upgrade was long overdue. I have 2 monitors, one of them is connected via HDMI, and the other via the DVI output since it's an older monitor. I use the primary one for gaming, the other one for just browsing the web and as a general-purpose second monitor. They work fine while doing some light work (watching movies, writing emails), but the problem starts when I launch up a game and bring some heavier load to it. It works fine for the first 10-15 minutes, but then both displays start flashing and turning on and off repeatedly. I have absolutely no idea what could be causing this, the drivers are up-to-date and the GPU work perfectly with only one of the 2 monitors connected to it, so the issue is only when using both of them at the same time. I tried using different ports on the GPU, such as one of the three DisplayPorts, but I ran into the same issue. Both of the monitors are set to the same resolution and the same refresh rate. AMD FreeSync is off on both, so they have the exact same settings. They both worked fine with the older R7 370, the problem appeared as soon as I installed the RX 580.

Any help with this is highly appreciated, thanks in advance!

 

[Zerk2012]

I recently bought a new GPU (AMD RX 580 8GB)

New or used?

 

[rajkovic.petar2000]

New or used?

It was used previously, yes

 

[rajkovic.petar2000]

Solved! For anyone encountering this error and coming across this post in the future, the issue was with Windows power settings. As soon as I set them all to "Never", everything came back to normal. Don't know why this happened to cause my issue, but I'm very happy to have solved it.