Go into your Control Panel and you'll find all sorts of places to Sounds and Audio Devices, where you can set features. You should be able to find a place to turn off sounds, and in the instance of startup you should be able to turn off the chime altogether. Under the Sounds tab you'll find Sound Events you can turn on or off.
You should find a Display box in Control Panel also, but I don't know if it will have any separate settings for your laptop. On my old laptop I would have gone into the system settings prior to Windows opening and fiddled with settings there. It must be easier to do now.