You might find pulling out the connector and putting it back fixes this. A similar effect sometimes happens on my work laptop - connected via a KVM to keyboad and monitor. Disconnecting/reconnecting usually sorts it out.
That was just a hopeful possibility. You indicated that you are using a "backup" keyboard. Did I understand that correctly? Have you tried another keyboard? I just wonder if it is an incompatibility of an old (?) keyboard with a new motherboard. So only solution is new(er) keyboard.
There were problems of older keyboards used with PS/2 adapters not working - capacitance if I recall. Could also apply to early PS/2 versions.
[So those real IBM keyboards with proper keyswitches had to be dumped :sad: . Built like the proverbial brick sh*thouse ]
Gary, it wouldn't be the sticky keys buzzer? I think BIOS or perhaps DOS has an in-built alert if a key is held for a certain period of time. I had similar odd sounds due to my X52 lead sitting on my keyboard during boot. :roll:
The Shell32.dll and Kernel.dll files are vital system modules, Shell for file handling and Kernel for memory managment BTW.
If you're using Windows XP goto Control Panel > Accessibility options and make sure StickyKeys is un-ticked. There you'll find additional sound notification settings which may help. Perhaps a key has become trapped; check none of them are 'stiff' or slow to depress. (wine and keyboards don't mix, I can tell you )
It might be worth unpluging your keyboard or testing with a spare to check that it's definately keyboard related.