Beep every 15 seconds.... at desktop

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Not sure where to go with this one. Every ~15 seconds my PC beeps (once) at desktop. I google searched and I only show beep codes at POST, nothing for beeps at desktop. I looked through my motherboard manual and there is no listing for the beep codes, the sounds are coming from the PC itself as it still does it even with the speakers powered off.

System Info:
Asrock P67 Pro3 Motherboard
I3-2100
ATI 5850
Gskil Ripjaws RAM
Antec Green 500D PSU

EDIT: Also it's not heat related, I checked HWmonitor and everything is fine (all temps under 45C).

Anyone have any ideas on this one?

 

[KazeoHin]

Unplug the keyboard. Does it still happen?

If so, check to see if your CPU fan is spinning, if it is, check your temperatures in BIOS and see if they are above the ~40 degrees this chip should be at in idle.

If it is, then run the Windows Experience Index and see if it beeps more or less frequently. If it does not, I've got nothing.

 

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CPU fan is spinning, temps are solid on CPU, 29C on idle (using a Corsair A50 cooler).

I'll try taking out the keyboard/mouse combo .

 

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Well was one of two things:

- I powered it up with the cover off and one of the case fans was not spinning, bound well up. The PSU +12V voltage was sitting at 11.52V in the mothboard health area. Replaced fan, now it's at 11.94V

- I swapped the Memory slots the RAM was in.

Problem has since gone away.