Extra "Beep"

Check what is going on in the autoexec and config also check for hardware conflicts.

Hi Leonard, the beep you can hear is from the Bios. Click on the below link or type it it for a list of beep codes and how to fix them. Good Luck..
http://www.geocities.com/SiliconValley/Lakes/3553/beeps.htm

You don't say whether the system is working correctly, apart from this annoyance.
If it is, I think what is happening is thatyou are getting a partial warning of a condition that then clears itself. Two possibilities: the system thinks it has a power failure because there is a heavy load at this point, which then decreases.
Alternatively, it thinks it has lost the graphics card, and then finds it.

I suggest you look at option 2 first, and see if there are two video cards listed in the control panel i.e. it starts on VGHA, beeps and switches to the more aadvanced version.

If it is a warning of the power getting close to maximum output then the only test is to borrow a higer rated one, see if that cures it and if so, actually spend some money.