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I'm pretty new to raspberry pi, and it always used to work fine, but I've got a new monitor, the BenQ GW2270, and I set my raspberry pi 4 up using the micro-hdmi to my monitor's hdmi port, and when I switched it on, I saw the rainbow coloured switching on screen, but then it just went black for a few seconds, then my monitor just said no signal, and I don't know why. Thanks for helping!

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Try the following:

  • Add hdmi_force_hotplug to /boot/config.txt
  • Add hdmi_safe=1 to /boot/config.txt
  • Use the old monitor to change the resolution to 640x480 and frequency of 60.00Hz (through Screen Configuration)
  • Make sure you are using the HDMI closest to the power input
  • If possible, plug the old monitor into the first HDMI and the new one into the second HDMI and see if they both display stuff.

Hope this helps you fix the problem.

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If possible find another linux device and connect that sdcard with that PC. Then go for config.txt and uncomment the the hdmi_safe=1. This could fix the hdmi output.

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    You can use Windows devices too as they can see the boot partition. – dominic03 Jul 15 at 16:06

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