If the second display works, the original monitor is at fault. Reseating the Graphics Card For desktop users, turning off the power and removing the graphics card can resolve connectivity issues.
Graphics Card No Signal Monitor Fix: Quick Resets and Swap Tests
Try using the existing cable with a different device. When to Seek Professional Help.
This confirms whether the cable is the weak link. Simultaneously, the power state of the source device provides critical clues about where the breakdown is occurring.
Reseating the Graphics Card to Fix No Signal Issues
Isolating the Culprit To determine if the issue is with the monitor, the computer, or the cable, you need to perform a swap test. 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.
More About My monitor says no signal
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