I have just had to reformat my hard drive. After reinstalling the OS my PC beeps when certain events occur, like error messages or if a setting is altered. How do I switch this off? It was never on there before!
From your last posting, I assume it is the case speaker that is producing the sound. If so, and if you have done a re-install, it does seem something either in the BIOS or in some fundamental part of the hardware that you have. Do a thorough check of all parts to ensure that they are firmly inserted into their connectors - and connectors firmly inserted into them.
Check you BIOS settings with your motherboard manual to see if any are wildy amiss from what they should be.