I can't get sound to work on this new laptop with Zorin 18 Pro. Tried a few things after googling it to no avail. Interesting a distro I tried with a Fedora base works fine (Aurora) but can't seem to get it with Zorin. Love the distro, have Pro so would like to get it resolved.... I am assuming it is likely a kernel thing but....
Probably you need a later kernel for your up-to-date hardware:
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From a websearch using" Dell PB16255 AMD Ryzen AI Pro 340 no sound ubuntu 24.04"
Stumbled on something interesting re Dell PB16255 sound failing after Windows Update here:
From there you can get to here:
That second Dell link, (once the page fully loads) you can choose Operating System, uncluding "Unbuntu 24.04". So you may want to see if any useful drivers are offered there.