nkS0403A1U only one output working

Mike H

December 19, 2025 02:03

I came home this evening to only one output working from my nkS0403A1U. I have unplugged all cables, restarted the computers, and reseated all cables after power cycling the kvm and still have the same results. Any thoughts? 

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• Official comment

  

  TESmart.02

  December 19, 2025 03:01

  Dear Mike,

  Thank you for getting in touch, and we apologize for the inconvenience you’re experiencing.

  To help us isolate the cause of the issue, we’d appreciate it if you could try the following when convenient:

  • Connect each monitor and video cable directly to your computer to confirm that both displays function normally on their own.
  • Swap the KVM output ports or video cables to determine whether the issue is related to a specific port or cable.
  • If your setup uses higher resolutions or refresh rates, please try temporarily lowering them to rule out any signal or compatibility issues.

  Additionally, could you please share your purchase invoice or order confirmation, along with the approximate purchase date? As a valued returning customer, we’re also happy to offer a loyalty discount if you’re considering a replacement or upgrade.

  Thank you for your cooperation. We look forward to your reply and will assist you further as soon as possible.

  Kind regards,

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