My setup has two monitors: LG 34GL750-B (Primary) and LG 29UM68-P (Secondary), if models matter. Randomly, when I power up my PC, my secondary monitor will display the desktop, but the primary needs to be turned off then turned back on. I can see all the POST messages and the Windows boot logo, but once it turns black, it stays black. I've refreshed the drivers for both monitors and my GPU (RTX 2070). Is there a setting I'm missing or should I replace my Display Port cables?