Dell only validated the provided 1m/3.2ft USB-C to USB-C cable. The U2720Q side USB-C downstream port is NO VIDEO, data only. You must use the bottom #5 USB-C port for video. Remove the power strip. The U2720Q should be plugged directly into the wall power socket AFTER doing the following = * Turn the MacBook off* Turn the U2720Q off* Disconnect every cable (including the power cable) from the U2720Q* Press the U2720Q power button in for 8 seconds (clears any residual power in the circuits)* Reconnect the power cable and our USB-C to USB-C cable to the U2720Q and MacBook* Turn the MacBook on, then the U2720Q
My U2720Q stopped accepting a signal from my USB-C port of my Mac. The MacBook still gets power from the U2720Q. But there is no video signal. I have tried both USB-C ports on the U2720Q and all three USB-C ports on the MacBook. I have also tried replacing the USB-C cable and it still does not work. The U2720Q says no signal detected In "Auto" or in USB-C input mode. I have also tried plugging and unplugging the U2720Q. The U2720Q is plugged into a power strip. It worked until yesterday
U2720Q, no longer accepting USB-C signal