Question 1

the kvm feature isn't switching between my laptop and desktop like it's supposed to, one computer never gets control.

Accepted Answer

DIAGNOSIS The KVM (Keyboard, Video, Mouse) auto-switch function is failing. This is usually due to incorrect cable connections or source priority settings. FIX Verify your physical connections. Computer 1 must be connected via USB-C. Computer 2 must be connected via DisplayPort or HDMI AND the USB-B upstream cable for peripheral data. The monitor's USB-A ports connect your shared keyboard and mouse. Do not mix this up. IF THAT DIDN'T WORK Manually set the source priority. Go to Menu > Input Source. Select the primary computer's input (e.g., USB-C). Then, go to Menu > USB-C / USB-B > USB-C Priority and set it to 'On' if Computer 1 is on USB-C. For auto-switch, ensure 'Auto-Scan' in the Input Source menu is 'On'. HEADS UP The KVM only switches when the target computer is awake and outputting a video signal. It will not switch to a sleeping or powered-off machine.

Question 2

the monitor won't wake up from sleep when i move my mouse, have to power cycle it every time.

Accepted Answer

DIAGNOSIS The monitor is not receiving a proper wake signal from the computer. This is often a handshake issue with the USB-C connection or a firmware bug. FIX First, disable the monitor's deep sleep function. Press the menu button, go to Others > USB-C / USB-B Wake Up, and set it to 'On'. Then, go to Others > Deep Sleep and set it to 'Off'. IF THAT DIDN'T WORK The issue may be with your computer's USB selective suspend setting. On Windows, search for 'Edit power plan' > Change advanced power settings > USB settings > USB selective suspend setting and set it to 'Disabled'. Test again. HEADS UP If you use the USB-B upstream cable, ensure it's connected to a main USB port on your PC, not a hub. Some motherboards do not provide wake signals through all ports.

Question 3

can i clean the screen with alcohol wipes? the anti-glare coating feels weird and smudges easily.

Accepted Answer

DIAGNOSIS The monitor has a matte anti-glare coating. Using harsh chemicals will permanently damage this coating, causing clouding or streaks. FIX Power off the monitor. Use a dry, soft microfiber cloth first to remove dust. For smudges, lightly dampen a second microfiber cloth with distilled water only. Gently wipe the screen. Never spray liquid directly onto the panel. IF THAT DIDN'T WORK For stubborn marks, use a screen cleaning solution specifically formulated for monitors and LCD/LED screens. Apply a small amount to the microfiber cloth, not the screen. Ensure it is alcohol-free and ammonia-free. HEADS UP Never use paper towels, kitchen towels, or window cleaner. The anti-glare coating is delicate. Abrasive materials or solvents like isopropyl alcohol will create permanent dull spots.

Question 4

the monitor randomly goes black for a second or two then comes back, happens every 10-20 minutes. using usb-c connection.

Accepted Answer

DIAGNOSIS This is a temporary loss of signal synchronization. With USB-C, it's often related to the cable, power delivery negotiation, or a computer sleep setting interfering. FIX Replace the USB-C cable. Use the one that came with the monitor or a certified high-bandwidth cable. Next, on your computer, go to Power & Sleep settings and set the 'Turn off display' and 'Put computer to sleep' timers to 'Never' as a test. If the blackouts stop, a system power state is causing the drop. IF THAT DIDN'T WORK Update your graphics driver. Then, on the monitor, go to Menu > Display > Power Button and set 'Power Savings' to 'Off'. This feature can sometimes cause aggressive blanking. HEADS UP If you are daisy-chaining a second monitor via the U2723QE's DisplayPort Out port, this can exacerbate signal stability issues. Test with only the primary monitor connected.

Question 5

the screen has a weird yellow or warm tint, colors look off compared to my other monitor. i didn't change any settings.

Accepted Answer

DIAGNOSIS The monitor's ComfortView or Color Preset mode is active. These are factory-set features intended to reduce blue light. FIX Press the monitor's menu button. Go to Color > Preset Modes. Select 'Standard' or 'Custom Color'. Then, go to Color > ComfortView and set it to 'Off'. This will revert to the default, cooler color temperature. IF THAT DIDN'T WORK Perform a factory reset. Go to Menu > Others > Factory Reset. This will wipe any inadvertent color calibration changes. Also, ensure the 'Input Color Format' under Display settings is set to 'RGB', not 'YCbCr'. HEADS UP The U2723QE uses an IPS Black panel which has higher native contrast and can appear richer/warmer than standard IPS panels. Give your eyes a day to adjust before deciding it's wrong.

Question 6

how do i get the built-in usb hub to work? my keyboard and mouse connected to the monitor's usb ports aren't being recognized by my pc.

Accepted Answer

DIAGNOSIS The downstream USB-A ports on the monitor require an active upstream connection to your computer. This is not established. FIX You must connect the monitor to your PC using either the USB-C cable (which carries video, power, and data upstream) or the separate USB-B to USB-A cable included in the box. For the USB-B cable, connect the square USB-B end to the monitor's 'USB Upstream' port and the standard USB-A end to a USB port on your computer. The USB-C connection handles this automatically. IF THAT DIDN'T WORK Check the On-Screen Display. Go to Menu > USB-C / USB-B and ensure the correct upstream source (USB-C or USB-B) is selected to match the cable you are using. HEADS UP The USB hub only has power when the monitor is on, not in standby. Devices may disconnect when the monitor sleeps if your PC's USB power settings are aggressive.

Question 7

the monitor makes a faint high-pitched whining or buzzing noise, seems to come from the top left corner. it's not the speakers.

Accepted Answer

DIAGNOSIS That is coil whine from the monitor's internal power supply or driver board. It's a physical vibration in electronic components, often triggered by high refresh rates or specific brightness/contrast settings. FIX Go into the On-Screen Display menu. Navigate to Display > Refresh Rate and change it from 60Hz to 59.94Hz. This small change often eliminates the resonant frequency causing the whine. If it's set to 59.94Hz, try 60Hz. IF THAT DIDN'T WORK Adjust the monitor's brightness. Coil whine can be worse at specific brightness levels, often around 50-70%. Try setting brightness to either 30% or 100% to see if it stops. HEADS UP This noise is generally not a sign of impending failure, just an annoyance. If it's loud and persistent under all settings, contact Dell support. The power supply unit may be defective.

Question 8

my new u2723qe shows 'no signal' when connected via usb-c to my macbook, it works fine with hdmi though.

Accepted Answer

DIAGNOSIS The USB-C connection isn't establishing a video link. The most common cause is an insufficient USB-C cable or a laptop port not supporting DisplayPort Alt Mode. FIX First, verify your MacBook model supports video output over USB-C. Then, use the Dell-supplied USB-C cable that came with the monitor. If you lost it, you must use a certified 10 Gbps (or Thunderbolt) USB-C cable that explicitly supports DisplayPort Alt Mode and 90W power delivery. Do not use a generic charging cable. IF THAT DIDN'T WORK Reset the monitor's settings. Go to Menu > Others > Factory Reset. Power cycle the monitor after the reset. Also, try a different USB-C port on your MacBook. HEADS UP Some older or budget laptops only support USB-C for data and charging, not video. The U2723QE requires a USB-C source with DisplayPort Alt Mode capability.

Dell UltraSharp U2723QE 27 inch 4K USB-C Hub Monitor

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