What does HRESULT 0xC0261005 (ERROR_MONITOR_WMI_DATABLOCK_REGISTRATION_FAILED) mean?

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Windows could not register one of the monitor WMI data blocks.

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ERROR_MONITOR_INVALID_STANDARD_TIMING_BLOCK	ERROR_MONITOR_INVALID_SERIAL_NUMBER_MONDSC_BLOCK

ERROR_MONITOR_WMI_DATABLOCK_REGISTRATION_FAILED

ERROR_MONITOR_WMI_DATABLOCK_REGISTRATION_FAILED is about exposing monitor information through WMI. It does not, by itself, say that the raw EDID is invalid. Windows groups several monitor data classes under the abstract MSMonitorClass, including identification, connection parameters, supported modes, and raw E-EDID blocks.

Targeted checks

Query the raw descriptor and a derived class independently. A raw block may be present while one derived representation is unavailable.
Use the same InstanceName when comparing WMI results so that a disconnected monitor or another display is not mistaken for the affected device.
Check the display miniport and monitor device state before changing WMI configuration. The error originates in the data-block registration path, not in a user WMI query syntax.

Get-CimInstance -Namespace root\wmi -ClassName WmiMonitorID

Microsoft: MSMonitorClass and its derived monitor classes

Microsoft: WMI Core Provider monitor data classes

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