Yes, the fact it is from your external speakers is a lot less worrying. In concur that with the others that it sounds like USB/Firewall connections being made or dropped, or some sort of similar connection.
Do you see the Add/Remove new hardware / removable hardware icon pop up while it happens? As long as it is not a hardware motherboard issue, you'll probably have to go through the basic Software troubleshooting steps of booting to safe mode, see if you have the problem, and then selectively starting the system with various system services started/stopped. If you think it may be your USB mouse or keyboard, borrow some cheap PS/2 alternative or use the USB - PS2 adapter to plug into the PS2 port and see if that solves the problem. My motherboard temperature warning would operate from the system speaker, and would normally shut down the system. Similar with voltage problems. My little memory reseident motherboard program also emits a clear Alarm sound, not boop boops. If you have one of those resident programs you can check that when you hear the sounds to see if it is flashing red or giving other warnings. You can use SpeedFan or Motherboard Monitor (free to try) to check your system temperature and the voltages across your power supply's lines to see if it's dropping out etc. You can also use the Performance Monitor and check the Interrupts to see if they are high, this usually indicated a problem with attached peripherals and accessories. Is there an unusually high System process in the CPU monitor of the Task Manager? -Gel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Discover CFTicket - The leading ColdFusion Help Desk and Trouble Ticket application http://www.houseoffusion.com/banners/view.cfm?bannerid=48 Message: http://www.houseoffusion.com/lists.cfm/link=i:5:146848 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/5 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:5 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.5 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54