Game without sound ?!

Hello, so I didn't rly play in preseason ,but i primarily stopped due to time and motivation, but also because my ingame client had no sound all of a sudden,despite it working before just fine. Since i wanted to play some league again, i looked into the issue and also consulted the internet ,but I haven't found a solution yet. I actualized all sound support programms, reinstalled league, repaired league,looked at possible file errors (one was mentioned for a similar problem) and cleaned my harddrive a bit again. Yesterday evening I had sound once,but a bit later I didn't have sound again. And today no sound as well. Without sound I can't focus very well and it ain't a lot of fun for me, but I have no clue where I should look for a solution, can anybody help me pls?
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