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 | Unexpected spike on my waterfall / IQ / spectrum. | It's either a [DC offset](https://hackrf.readthedocs.io/en/latest/faq.html#what-is-the-big-spike-in-the-center-of-my-received-spectrum) or noise from power. For reducing the noise, try using the internal battery. For DC offset, there's nothing you can do, however it’s normal on SDR. |
 | My computer can't see my HackRF no matter what I do | Try at least 5 different cables. If you are on Windows, try to install [Zadig](https://zadig.akeo.ie/), if not working, try on a Linux machine (exclude Ubuntu) |
 | My sound board app can't see the files i putted in, but my fileman app can | folow [Soundboard](https://github.com/portapack-mayhem/mayhem-firmware/wiki/Soundboard) to make correct file |
+| Screen went black when transmit/ replay |Check [Stealth Mode](https://github.com/portapack-mayhem/mayhem-firmware/wiki/stealth-mode) |
 | Something else | Check more _Troubleshooting_ topics on the sidebar |