Black screen after boot screen

Hi! I wanted to update my OS to the new version, so last week i clicked on the System Update app, but nothing happened. No downloading, no installation. I waited some time, but closed the app in the end. I use the deck image on my HTPC and i switched back to gamemode and started playing. On the next day after the boot screen the screen turned black. I can not boot into my PC ever since. What should i do? Did i fucked up my OS?
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