Hi Filip!
In my experience it still could be the power switch board cable... But it's also possible that your drive is dying.
What do you hear when you try to open the disc tray?
If you don't hear any sounds > power switch board ribbon cable could be faulty.
If you hear the drive trying to open, but it stays shut > faulty drive/rubber belt
Guide for the ribbon cable > Xbox 360 S Faceplate Replacement
Guide for the drive: Xbox 360 S Optical Drive Replacement
If it's possible to create a video for this and share it with us, that would be great!
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Is there currently a disc in the xbox 360?
crwdns2934271:0crwdnd2934271:0 Hampter crwdne2934271:0