I am having issues setting up my new RPi 4 8GB.
When I switch the Pi on with no SD card inserted my monitor detects it but when I insert an SD card into the PI and power on nothing comes up on the screen. I have tried 4 different images (RPiOS being one of them) using balena etcher to write the SD card on three seperate SD cards (one of them a brand new San Disk ultra). I also tried using NOOBS as that can just be extracted and then the files copied to a freshly formatted SD card instead of actually needing to be written but still no signal on my monitor when the SD card is inserted. The read light on the Pi is flashing irregularly as you would expect when it is reading correctly. I have checked the obvious things like using the correct HDMI port on the Pi and ensuring the SD card is inserted correctly and I am using the official RPi 4 power supply.
Any help would be much appreciated!