Dell U5226KW Monitor May Not Show Video After it is Power Cycled, or the Cable is Reconnected

Summary: Information about a no video issue when the Dell U5226KW monitor is unplugged and plugged back in or powered on and off.

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Symptoms

When the monitor is connected using a Thunderbolt 4 cable, it will lose video after these two actions:

  • The Thunderbolt cable is disconnected and reconnected.
  • The connected system is powered off and on.

Affected Systems:

  • Dell Pro Max 16 Plus MB16250
  • Dell Pro Max 18 Plus MB18250

Affected Monitor

  • Dell Ultrasharp U5226KW

Cause

No cause information is available.

Resolution

To resolve this issue, update to BIOS version 3.1.1 or later.

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Affected Products

Dell Pro Max 16 Plus MB16250, Dell Pro Max 18 Plus MB18250, Dell UltraSharp 52 Thunderbolt Hub Monitor U5226KW
Article Properties
Article Number: 000414316
Article Type: Solution
Last Modified: 21 Jul 2026
Version:  5
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