Boot a live USB of Linux Mint XFCE or Ubuntu MATE. The kernel’s snd-hda-intel module contains a specific quirk for the Dell Inspiron 1525 ( model=dell-m6 or dell-s14 ). The jack detection, internal mic, and even the front media buttons work flawlessly. No driver hunting. No signing errors.
But if Windows is your hill to die on, at least now you know why the silence fell—and exactly how to break it. dell inspiron 1525 audio driver
: Get the driver (usually a .exe file) from the Dell Support site. Boot a live USB of Linux Mint XFCE or Ubuntu MATE
Is the "No Audio Device" error showing in the ? dell inspiron 1525 audio driver