If the monitor recognizes a signal but the wrong input is selected, you might see a "no signal" message on one port while the other is active. Try using the existing cable with a different device.
Monitor No Signal While Computer Running: Key Causes and Fixes
Booting into Safe Mode or using a different display driver profile can bypass these conflicts. It is a communication error rather than a definitive hardware failure, and the root cause can range from a loose cable to a faulty graphics card.
Users often overlook the simple because it seems too obvious. Connect a different monitor or TV to your computer.
Monitor No Signal While Computer Running: Key Causes and Fixes
This confirms whether the cable is the weak link. Input Source and Power State Monitors often have multiple HDMI, DisplayPort, or VGA inputs.
More About My monitor says no signal
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