So,
I just bought a new Raspberry Pi 4 B 2gb for libreelec. I plugged my HDMI Cable into into my Micro-HDMI-Adapter and it worked normally. I had some Streaks but i thought they would go away if i unplug it and plug it back in. It still had these Streaks. Then i rebooted and it started to show red Streaks, and the Bootscreen background was red. I Unplugged it and plugged it back in but it showed nothing anymore. The Pi still Boots, and my TV even sees that a Raspberry Pi is connected. I am using LIbreelec 9.2.3. I hope anyone is able to help and i apologize for Grammar-Mistakes.