Symptoms
- Blue or black screen with the projector fan running
- 'No signal' message on screen
- Picture was fine yesterday, now blank
- Works with one device but not another
Likely causes
- CommonWrong input source selectedThe projector is looking at HDMI 2 while the cable is plugged into HDMI 1, for example.
- CommonLoose or bad HDMI/video cableA cable that's partially unplugged or damaged can pass no signal at all.
- CommonSource device asleep or offA laptop, streaming stick, or console that's sleeping sends nothing to display.
- PossibleResolution mismatch between source and projectorThe source may be outputting a resolution the projector doesn't support.
- Less commonFailed HDMI port or main boardMore likely if the issue is on every input, not just one.
What to do
- Press the 'Source' or 'Input' button on the remote and cycle through every input to confirm the right one is selected.
- Wake or power-cycle the source device (laptop, console, streaming box) and check for activity lights.
- Reseat the video cable at both ends, or swap in a different HDMI cable known to work.
- Try a different HDMI port on the projector to rule out one bad port.
- If using a laptop, use its display/output shortcut (often a function key) to force video output to an external display.
- Lower the source's output resolution to 1080p or 720p and see if the picture appears.
- Test the same cable and source on a TV or monitor to isolate whether the projector or the source is at fault.
Tools and parts
- Spare HDMI cable, if available
When to call a pro
If every input is blank with confirmed-good cables and sources, the projector's video board may need repair.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.