Verify if the device is detected in Windows Device Manager and that the correct device drivers are installed. Open the Windows Display Properties and go to Multiple Displays control to set the display to the extended mode. User Authorization - Allow User Notification devices at a minimum - the CM requests connection approval from the host SW and autoapproval may be given based on the Unique ID of the connecting device. HBR3 is DP 1.4 (8.1 Gbps maximum link rate per lane). With DP overhead, the effective data rate is 6.5 Gbps per lane. If only one monitor is shown, while the other is not, go to Windows Display Properties, and under Multiple Displays, select the output for the second monitor.

HBR3 (HBR3 x4 lanes + HBR3 x1 - 32.4 Gbps) For Precision 7530/7540/7730/7740 with discrete graphics card Secure Connect: The Thunderbolt adapter port allows connection to devices that have been configured with a shared key. DisplayPort Only: Automatically connect to DisplayPort devices only. No Thunderbolt adapter or PCIe devices are allowed to connect. External monitors require a certain amount of bandwidth to work properly. Monitors with higher resolution require more bandwidth.Reset the monitor to Factory Defaults. See the User Guide of your monitor for more information about how to reset the monitor to factory defaults. For additional help, learn How to Set up Multiple Monitors or How to Troubleshoot Multiple Monitor Issues. User Authorization: Approval is required for any new devices that are connected to the Thunderbolt port. Secure Connect - Allow one-time saved key devices at a minimum - the CM requests connection approval from the host SW and autoapproval is only given if the host challenge to the device is acceptable.

HBR2 is DP 1.2 (5.4 Gbps maximum link rate per lane). With DP overhead, the effective data rate is 4.3 Gbps per lane

When disabled, the Thunderbolt Technology feature is disabled, and any connected Thunderbolt adapter devices are not available in preboot or within the operating system. When enabled, this setting allows PCIe devices that are connected through a Thunderbolt adapter (that is PCIe devices behind the Thunderbolt adapter) to perform the PCIe device’s UEFI Option ROMs (if present) during preboot.