Hey there…
LE has always had a love hate relationship with sound - it either works fine or not at all…
The most obvious question is what changed on your system between when it was working and not?
LE struggles to automatically chose the audio output that windows (assuming windows?) has selected as default. I have had this just from messing with HDMI sound vs on-board motherboard sound. It was for something totally unrelated but LE sound just stopped for no apparent reason.
It regularly messes up, especially if you are using third party sound processing and people using Voicemeeter virtual audio devices have had issues more than once in the past - especially if using older versions of Voicemeeter.
The game is pretty CPU intensive and sound troubles can also sometimes be attributed to the game being unable to keep up… This usually presents as stutters rather than total silence tho… its still important to understand that if you are doing any additional processing on your system while playing, it could be involved.
An important thing to note here is that LE will not change the sound if its already running and you change windows defaults… at least, thats my experience. You have to shutdown LE, then change things and restart LE before anything registers.
Sometimes unplugging sound devices from your system and then plugging them in again, seems to reinitialise the sound and it works again. This has worked for me a few times but not always.
Playing with the sound volume has also been successful for some - i.e. moving the slider all the way off, and then all the way on seems to kickstart things again… .Why I have no idea…
Please can you include your player.log (games debug file) - it may be logging a specific problem.
Please can you also make sure that there are no outstanding device driver updates for your system and double check any sound related apps for updates too (e.g. Voicemeeter). As a general test, please temporarily dont run anything else on your system while testing LE - there are known issues with other apps and the game engine so its important to check this… Note that you may have to temporarily disable services etc and might need to reboot to ensure nothing is still active for this.