OK I know about BIOS alarm codes and temperature / fan failure warnings but this is not one of those:
I've got a PC which is mostly new components, I put it together earlier this week but was getting temperature warning beeps from the CPU sensor so yesterday I swapped out the cooler for something more sophisticated.
The CPU temps are fixed now and don't get above 60C, but when my computer has booted and gets to the Windows login prompt (or a little later) it emits a long beep - four or five seconds long. Then it usually stops, then it does another long beep (maybe ten seconds) and goes quiet.
I can't see any hardware issues. All the RAM is there, fans are behaving normally, all the drives are present and available, there's also a Firewire card with an ASIO interface attached and these are working correctly too, all the front panel stuff works, etc. Absolutely no hardware issues that I can find, and apart from this warning buzzer every time I start up the thing is running just fine.
Any ideas? First one to suggest unplugging the case speaker wins nothing whatsoever.