Dell U2711 stay black or wont Power on
1. Pull the powerplug out. 2. Hold on the Power-Button to get a full discharge (about 10 Sec.) 3. Reconnect powerplug. https://www.dell.com/community/Monitors/Dell-u2711-displayport-problem-quot-entering-power-save-mode/m-p/3546231#M79287