short buzz from Gigabyte motherboard at boot

I have a sonar PC based on a gaming Gigabyte GA-965P-S3 (rev3) socket 775 motherboard. I recently had to replace the motherboard, as the original had failed.
As these motherboards are no longer current, the unit I replaced it with was ex-equipment - so may not be 100% itself, but I have to assume that it is until proven otherwise.
The system appears to be OK - does everything it needs to do and I have given it a couple of hours running with a CPU/GPU/HDD loading utility.

However the motherboard makes a short alarm buzz (along with its happy "bleep") when I boot from poweroff state - see here:


anyone know what that buzz might be trying to tell me?
thanks in advance

It's means it's totally fine. Known as bios beep code. Used in diagnostics in boot failure.



AWARD BIOS Beep Codes
1 short: System boots successfully
2 short: CMOS setting error
1 long 1 short: DRAM or M/B error
1 long 2 short: Monitor or display card error
1 long 3 short: Keyboard error
1 long 9 short: BIOS ROM error
Continuous long beeps: DRAM error
Continuous short beeps: Power error

Dan.