sorry for bad quality but here is a rundown of what you need to do but basically you need to download the .wav file of what you want the sound to be then you need to download winaero tweaker its safe here's the page for it https://winaerotweaker.com/ go down to the appearance section and find startup sound then tap replace startup sound and tap the .wav file but make sure you have startup sound enabled to make sure tap settings go to system then sounds and once you do that tap on more sound settings then it will open a menu tap on sounds and make sure the box that says play windows startup sound is checked that is all bye.