If you have followed the installation procedure. Make sure the SymplySPARK heartbeat light is flashing @ 1Hz (once per second), this will indicate that the controller is functioning as it should.
If the driver is installed and the cable is connected correctly then the SymplySPARK will be seen in the Thunderbolt Control Center.
Check that the Thunderbolt cable is securely connected, and that it is a Thunderbolt certified cable it will have the lighting logo on it. Likewise, if you are using a Thunderbolt 2 to Thunderbolt 3 converter it should be the Apple adapter, part number MMEL2ZM/A.
Also check that the Thunderbolt 3 port you are using is a Thunderbolt 3 port and not just a USB-C port. Note if you are trying to connect via a hub, it must be a Thunderbolt 3 hub connected to the computer’s Thunderbolt 3 port (check the port for a lightning logo) and not just USB-C.
Check that the driver is installed correctly, and try re-installing the drivers. You should first use the “Add or remove programs” application in Windows to uninstall the Symply RAID Manager and reboot the Windows machine, ahead of reinstalling the driver package.
Please submit a [support ticket] if you are still experiencing issues.
If you have any questions please submit a [support ticket]