Interactive fix flowchart
Monitor not working
Fix monitor no signal, HDMI not working, DisplayPort problems, USB-C monitor issues, second monitor not detected, flickering, and out of range errors.
All fixes in this guide
Fix: Monitor says no signal
A monitor says no signal when it is powered on but not receiving video from the computer, console, dock, or adapter.
Fix: Monitor says no signal after sleep
A monitor that loses signal after sleep usually points to a wake issue, graphics driver problem, dock problem, or power saving setting.
Fix: Monitor says no signal with adapter
No signal with an adapter usually means the adapter is the wrong direction, the port does not output video, or the adapter does not support the resolution or refresh rate.
Fix: Second monitor not detected
A second monitor is usually not detected because of the wrong input source, loose cable, bad adapter, display settings, graphics driver issue, or a port that does not output video.
Fix: HDMI not working
HDMI problems are usually caused by wrong input source, a loose or bad cable, wrong adapter direction, a sleeping source device, or display settings.
Fix: DisplayPort not working
DisplayPort problems are usually caused by a loose cable, monitor input source, graphics driver, high refresh rate issue, or adapter direction mistake.
Fix: USB-C monitor not working
A USB-C monitor only works if the USB-C port, cable, and monitor support video. Many USB-C ports and cables are charge-only or data-only.
Fix: Monitor flickers or goes black
Monitor flickering is usually caused by a loose cable, bad cable, unsupported refresh rate, graphics driver issue, power problem, or adapter limitation.
Fix: Monitor says out of range
Out of range means the computer is sending a resolution or refresh rate the monitor cannot display.
FAQ
Why does my monitor say no signal?
No signal usually means the monitor is on but is not receiving a video signal from the computer. The common causes are wrong input source, loose cable, wrong cable direction, sleeping computer, bad adapter, or a graphics output problem.
What should I check first when a monitor is not working?
Check power, input source, cable connection, and whether the computer is awake. Then try another cable, another port, or another monitor if available.
Can the wrong cable cause no signal?
Yes. Direction matters for some adapters. DisplayPort to HDMI is not the same as HDMI to DisplayPort, and USB-C video only works if the USB-C port supports video output.
Why is my second monitor not detected?
The second monitor may be on the wrong input, using a bad cable or adapter, connected to a port that does not output video, or disabled in display settings.
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