Sorry for late reply, school's keeping me busy. Anyhow sounds pretty good, the sound happens with some people. Its usually a hardware or driver type of thing. I belive i had this problem, when my sound card drivers were out to date.
You could simply just turn off the startup sound by doing this. As well maybe search for drivers.
1. Click Start , type mmsys.cpl in the Start Search box, and then click mmsys.cpl in the Programs list.
2.If you are prompted for an administrator password or confirmation, type your password or click Continue.
3.Click the Sounds tab.
4.Click to clear the Play Windows Startup Sound check box, and then click OK.
BTW i like your rig