3rd monitor turns off the other 2 when plugging in displayport

Apr 9, 2018
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I recently got a Dell S2417DG to finally complete my 3 mt 3 monitor setup, however, the displayport causes some problems. I currently have 2 Viewsonic VX2453 that have been working for years. I have a Radeon R9 290 installed that has 2 DVI ports, an HDMI port, and a Displayport. One of my viewsonic monitors is connected via HDMI to DVI and the other is connected to just HDMI. My new monitor does work when plugged in through HDMI but that doesn't help me for a 3 monitor setup. I searched and searched but I can't seem to find people with the problem of their screens turning off. I can't even look at if Windows is detecting the monitors when all 3 are plugged in. I have tried turning the power options to High Performance mode but that didn't seem to help. Any help would be greatly appreciated.

My specs:
ASUS P877-VPro
Intel i7 3770K
Monitors as stated above
Corsair GS700
16 GB of RAM
PowerColor PCS+ Radeon R9 290