The only thing Dr. Google revealed was some monitors having a "theft mode" than needed some strange front panel button presses to reset.
Try connecting the Raspberry to some other TV/monitor.
Microprocessor, Raspberry Pi & Arduino Hacker
Mainframe database troubleshooter
Since 2012: 1B*5, 2B*2, B+, A+, Zero*2, 3B*3
Please post ALL technical questions on the forum. Do not send private messages.