BenQ Projector No Signal — How to Fix It

What it means

BenQ projector No Signal means the selected input has no active video.
Check the input source is correct, the HDMI or VGA cable is firmly connected, and the source device is on and outputting video.

How to Fix It

Confirm the source device is active

Ensure the laptop, PC, or media player connected to the projector is powered on and not in sleep mode.
A sleeping device sends no signal and causes No Signal on the projector.
Select the correct input

Press the Source button on the BenQ remote and cycle through HDMI 1, HDMI 2, VGA, etc. Match the input to the physical connection.
An incorrect input selection always shows No Signal.
Reseat the connection cable

Unplug the HDMI or VGA cable from both the projector and the source.
Wait 10 seconds and firmly reconnect both ends.
Loose cables are the most common cause of No Signal.
Enable laptop external display output

On Windows: press Win + P and choose Duplicate or Extend.
On Mac: System Settings > Displays > check Extend Display.
Some laptops suppress external output until prompted.
Try a different cable or HDMI port

If the BenQ projector has two HDMI inputs, test the second port with the same cable.
Also try a replacement HDMI cable to eliminate a faulty cable as the cause.
Match the output resolution to the projector

Set the source device resolution to 1080p (1920x1080) at 60Hz.
Resolutions or refresh rates the projector does not support (e.g. 4K on a 1080p projector) can cause No Signal.

Frequently Asked Questions

BenQ projector No Signal but laptop screen is working fine?

The laptop is outputting only to its own screen.
Press Win + P on Windows and select Duplicate or Extend to enable output to the BenQ projector as well.

BenQ projector No Signal after connecting a game console?

Check the console video output settings.
PlayStation and Xbox must have their video output set to HDMI.
Also verify the HDMI cable is plugged into the ARC or output port on the console, not an input port.

BenQ projector alternates between No Signal and image every few seconds?

An intermittent signal is almost always caused by a loose or damaged HDMI cable.
Replace the HDMI cable and ensure both connectors click firmly into place.