Check whether the stick or monitor is defective.
There is a method how you can do this:
1. Remove the stick from the monitor.
> If the monitor starts normally, the stick is defective and must be replaced. Please contact your sales representative.
2. If the monitor remains black, please check the power connection again; if there is still no signal, the monitor is defective and must be replaced.
You can also contact to brodos.net support:
Timings: Monday to Friday (9:00 AM to 6:00 PM)
Number: +49 9133 7770 800