[IriDium]

This is my config.txt - I can play movies quite happily, even with the rainbow of death. I'm going to try a 3.7amp PSU and if that doesn't work!!!!

#initramfs initramfs.gz 0x1000000
gpu_mem_1024=320
initial_turbo=3
hdmi_ignore_cec_init=1
disable_overscan=1
disable_splash=1

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I've done some checking and the rainbow box only came on when the amps were greater than 500ma. Which got me wondering.

As most leads are designed for the normal 500ma phones, etc, I have a feeling it is the leads being used and not the PSU.

Having switched to a 1amp PSU and a much thinker cable, the rainbow screen has not reappeared.