Multiple Docking Stations are not Simultaneously Supported Error Message
https://www.dell.com/support/kbdoc/en-us/000128984/dock-wd19-post-error-multiple-docking-stations-are-not-simultaneously-supported
1. Disconnect the docking station from your system.
2. Boot into the BIOS
a. Restart the system and tap the F2 key at the Dell Splash screen during system startup.
3. Clear the BIOS event logs
a. Go to System Logs and then BIOS Events.
b. Clear the logs.
4. Reset the system BIOS to factory defaults by clicking the Restore Settings button.
5. Reboot the system.
6. Connect the docking station.
7. The POST error will not re-occur. If the issue persists, contact Dell Technical Support
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