Glitchy HDMI output

I’ve setup my Mars for the first time, and the output from the HDMI is coming through heavily distorted. When the screen isn’t flashing, I can see that everything else about it is functioning as it should. I’m able to log in and use the official Debian image if I work through the display issues.

The distortion changes when I alter the resolution size and/or refresh rate. One monitor displays the HDMI signal with difficulty (giving the message “Signal out of range”), while a different monitor didn’t display anything.

Does anyone have an idea on how to fix this?

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I have met the problem on my Mars too, with the monitor AOC e951f no signal (1440*900, HDMI to DVI, are these the cause? ). The same problem occurred when I used my Sipeed LiCheePi 3A. Have u found the solution?

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