No power & starting

Check the monitor’s power path

Confirm the wall outlet works with another known-good device, then inspect the monitor cord and external adapter. Verify the adapter is firmly connected at the monitor and outlet and that its rating matches the unit label. Look for a power indicator when pressing the monitor’s own power control. This separates a monitor with no visible power from a computer that is simply asleep or not sending video.

Do not substitute an adapter because its plug fits. If the cord is cut, adapter is unusually hot, connector is loose, or there is an electrical odor, stop using it and contact support. Do not open the adapter or monitor.

Test the monitor independently of the host

Disconnect the video cable and press the monitor’s power button. A powered monitor may display its OSD or a no-signal message; exact behavior varies by model. If that appears, the display has at least some power and can generate its own image. If the monitor remains dark with no indicator or OSD, focus on outlet, cord, adapter, button, and service rather than graphics settings.

If the power indicator is on but the screen is black, use the no-signal path: select input, wake the computer, and test the source. Power and video are separate. A black image alone does not prove the display is failing to turn on.

Avoid unsafe electrical workarounds

Do not bypass a grounded plug, use a damaged extension lead, or daisy-chain power strips to test a monitor. Do not repeatedly reset a breaker if the circuit trips. If an outlet is loose, hot, scorched, or sparking, leave it unused and have the electrical condition assessed. Keep power bricks ventilated and away from fabric or paper.

If the monitor uses USB-C power from a host, confirm the port supplies the required power and use the cable specified for that function. A computer may provide video but insufficient power, or the monitor may require its own adapter. Check the exact manuals for the direction and wattage.

Escalate after the basic checks

If the outlet and correct adapter work but the monitor’s indicator and OSD remain absent, contact the manufacturer with the model code, serial, adapter label, outlet test, and indicator behavior. Include any recent electrical event, move, or liquid exposure. Ask whether the adapter is separately replaceable or whether the monitor needs inspection.

Do not remove the rear cover or probe the power board. Internal circuits can remain hazardous after unplugging. If the product is under warranty, use the approved support route before third-party repair.

Check whether the indicator responds to the monitor button

Use the physical power button on the monitor rather than relying on the computer’s keyboard or dock wake command. Note if the indicator changes state or the OSD appears. If the button is hard to locate, use the model’s control diagram; joystick and button positions vary. A lit indicator with no computer image belongs to a no-signal check, whereas no light and no OSD directs attention to the power path. Do not keep tapping the button or repeatedly reconnecting a damaged adapter.