an unidentified noise

[Mary]

It was the case speaker. I disconnected it from the MB. I just don't understand why it made that noise and still could produce the proper beeps at start up. So, now I'm wondering how to plug the speaker back in and not get the noise. I do not have a system fan plugged into the MB. There is a system fan but plugged into a molex. I may try to round up an adaptor/connector and see if plugging the system fan into the MB will stop the noise. The system is working fine and since I replaced the heatsink it's temp is 46C. It use to run at 60C. I'm so glad and thankful for you guys, your all so much help.