S2721DGF, goes black until power cycle, *FIXED*

Today my S2721DGF out of nowhere began going black after 20-40 seconds, and would not show anything until I pressed the power button twice.

The screen is not 'showing' black, it is no longer lit. The power button -is- lit.

The screen does not drop from Windows provisioning (e.g., my second screen does not start acting as the 'main' screen) until I press the power button. The sound of a device being disconnected also plays.

When I press the power button a second time, the screen returns and becomes the main screen again.

Things I have already tried:

• changing Auto Input to "no"
• Turning off G-Sync
• Turning off HDR
• Leaving the system and monitors alone and unpowered for 12 hours
• Re-seating DisplayPort plug on graphics card and monitor
• Trying different DisplayPort plugs on my graphics card

Any advice on how to fix this problem would be appreciated.

Edit: fixed it by unplugging it for 20 seconds. Thanks, Dell tech support!