How come I don't hear that chime anymore when I boot up my pc ?

You know that chime you hear when you boot up Windows 7 it happens as soon as you get to your desktop after powering on. For me it does it only once in a while it seems, actually I have not heard in a couple of days. I did a fresh new install like a few days ago. Other than that everything is working great. Even though it's not a big deal but it's kinda bothering me as to why it's not doing it. Could it mean there is something wrong ?

Control Panel--> Sound--> Sounds tab. Make sure there's a check in the 'Play Windows Startup sound' checkbox.