I hope that will solve it for you. Too bad you didn't have an addon speaker for boards you could use there since you were seeing a voltage spike at post time. Those simply plug in on the same or second block of pins for the additional usb ports.
The review on the board is good. PCSTATS at
http://www.pcstats.com/articleview.cfm?articleID=2099 But it may still turn out to be something besides the board itself.
AMI (American Megatrends International) BIOS Beep Codes.AMI BIOS uses beeps of the same length and pitch. The error is displayed as a number of beeps. For example, 4 beeps indicated a timer failure. BEEP CODE MEANING POSSIBLE CAUSE 1 Beep (No video) Memory refresh failure Bad memory
http://www.amptron.com/html/bios.beepcodes.html
Explanation: The system is having a problem accessing the system memory to refresh it.
Refreshing is done on all system memory to keep its contents active.
Diagnosis: This code usually means a problem either with the system memory or with the motherboard itself.
http://www.pcguide.com/ts/x/sys/beep/ami.htm
That model sees an AMI bios there while these are still generalized being old pages seen at the links there. If you had other memory onhand that would certainly tell fast.