I have just installed an ARECA 1210ML external RAID controller in an early 2008 octocore Mac Pro. Everything seems to be working fine. However, when I press the power button to switch on the Mac, there is a immediate loud single beep. I am using refit & the beep happens before the list of OS's appears. There is a system setting in the ARECA config web interface that allows me to disable the system beeper but it doesn't seem to stop the beep. Suggestions gratefully received.