I currently own dell inspiron 15 3576, it has i7 8550u with Amd Radeon 520 but it doesn't show in bios as if my laptop doesn't have one, it used to show before on both linux and windows when i was installing, but stopped later on with a windows update
i tried reinstalling windows, deleting the drivers, using linux live installation with no operating system on the laptop and nothing so far
i don't know whether the gpu is now dead or not but i'm sure that it used to work before the windows update
What OS? Win10 or Win11?
Did you update the Intel graphics driver? This must be done before installing the AMD driver. Intel support/updates > https://www.intel.com/content/www/us/en/download-center/home.html
Check device manager / display...does it show there?