I just received a new Raspberry Pi 4 4GB version. From the time of the first boot, I have colorful pixels showing up in different places on the screen. I'm using an FHD 1920x1080 screen and I have tried both of the HDMIs on the pi. I'm using a microHDMI to HDMI converter cable. The HDMI connector that is the closest to the headphone jack works best. I've also tried setting different amounts of RAM on the GPU, but nothing works. At the moment I set it on 512MB. I tried editing the config.txt but it doesn't help. I'm using the official USB-C power supply. I would be thankful for any help.