[First Homebuilt] System speaker buzz after POST beep

First of all, I've searched and have seen many references to buzzing speakers, but this isn't a case of radio-interference. I've not found any threads similar to the problem in my rig, but I apologize if I have missed something. Here's what's happening...

Immediately after the POST beep, the little internal speaker starts to buzz--loudly. It also sometimes sounds a bit like a modem connecting (squawking). I've confirmed it's the little speaker by disconnecting it and hearing no more buzz.

The buzz is persistent and loud, and I'm sure the component was plugged into the correct place on the mobo (and the POST beep is fine).
I've been careful about static and correct connections, and I don't see any obvious short circuits.

Assistance would be greatly appreciated. Any ideas?



System Details:

A very generous friend gave me the following, to help pull me out of the Dark Ages on my limited budget (my brother had given me Battlefield 2 for Christmas back in 2006 and I still couldn't play it):

CPU: AMD--Phenom II X3 710 (Brand New)
http://www.amazon.com/Amd-Phenom-I [...] 433&sr=8-2

RAM: Corsair--Two 2-GB DIMMs of DDR2 800MHz (Used)
I'll pull them out if details needed, but I think this is right:
http://rapidshare.com/files/321926 [...] 1.rar.html

HDD: Seagate--Barracuda 7200.1 SATA, 1.5 TB (Brand New)
http://www.newegg.com/Product/Prod [...] 6822148337

OS: Microsoft--Windows 7 Home Premium (Brand New)

GPU: EVGA--9800 GTX+ (Used; seems to run hot, which seems typical based on reviews)
http://www.newegg.com/Product/Prod [...] 6814130339

Based on what I learned here and elsewhere, and the fact that my friend had some of these components in her rig, I bought the following:

Case: NZXT Whisper Full Tower (Brand New)
http://www.newegg.com/Product/Prod [...] 6811146051

Motherboard: Gigabyte--GA-MA790X-UD4P (Brand New)
http://www.giga-byte.com/Products/ [...] uctID=3038

PSU: Corsair--CMPSU-750TX 750W (Brand New)
http://www.newegg.com/Product/Prod [...] 6817139006

ODD: LG--BH08LS20 (Brand New)
http://www.newegg.com/product/prod [...] 6827136164

Thanks again!

Is your PC working? If so I wouldn't worry about, you really only need the system speaker to debug a no-post, so you can just remove it.

I doubt that the buzzing is pointing to any issue with your PC. It could be interference from any number of sources, or maybe just a flaky speaker.